{"version":3,"sources":["webpack:///./node_modules/@ckeditor/ckeditor5-engine/src/view/element.js"],"names":["Element","document","name","attrs","children","_this","Object","D_Projects_UA_repo_Source_Client_UA_User_Web_node_modules_babel_runtime_helpers_esm_classCallCheck_js__WEBPACK_IMPORTED_MODULE_17__","this","_super","call","_attrs","parseAttributes","_children","_insertChild","_classes","Set","has","classString","get","parseClasses","delete","_styles","StylesMap","stylesProcessor","setTo","_customProperties","Map","_isAllowedInsideAttributeElement","length","type","arguments","undefined","index","node","indexOf","Symbol","iterator","getAttributeKeys","regeneratorRuntime","wrap","_context","prev","next","size","isEmpty","delegateYield","keys","stop","getAttributes","_context2","entries","getAttribute","key","D_Projects_UA_repo_Source_Client_UA_User_Web_node_modules_babel_runtime_helpers_esm_toConsumableArray_js__WEBPACK_IMPORTED_MODULE_8__","join","inlineStyle","toString","otherElement","isAllowedInsideAttributeElement","_step","_iterator","_createForOfIteratorHelper","s","n","done","_step$value","D_Projects_UA_repo_Source_Client_UA_User_Web_node_modules_babel_runtime_helpers_esm_slicedToArray_js__WEBPACK_IMPORTED_MODULE_6__","value","err","e","f","_step2","_iterator2","className","_step3","_iterator3","getStyleNames","property","getAsString","_len","Array","_key","_i","_className","getNormalized","expand","_len2","_key2","_i2","_property","_len3","patterns","_key3","matcher","D_Projects_UA_repo_Source_Client_UA_User_Web_node_modules_babel_runtime_helpers_esm_construct_js__WEBPACK_IMPORTED_MODULE_5__","Matcher","parent","match","getCustomProperties","_context3","classes","from","sort","styles","attributes","map","i","concat","deep","childrenClone","_step4","_iterator4","getChildren","child","push","_clone","cloned","constructor","set","getFillerOffset","items","childCount","_fireChange","_step5","count","nodes","normalize","_iterator5","_remove","splice","howMany","String","clear","_step6","_iterator6","toArray","add","_step7","_iterator7","_step8","_iterator8","remove","Node","toMap","_step9","_iterator9","_step9$value","classesSet","classesString","classArray","split","forEach","Text","isIterable","TextProxy","data"],"mappings":";;;;OA6CqBA,6CAiBpB,SAAAA,EAAaC,EAAUC,EAAMC,EAAOC,GAAW,IAAAC,EAuC9C,GAvC8CC,OAAAC,EAAA,KAAAD,CAAAE,KAAAR,GAC9CK,EAAAI,EAAAC,KAAAF,KAAOP,GAQPI,EAAKH,KAAOA,EAQZG,EAAKM,OAASC,EAAiBT,GAQ/BE,EAAKQ,aAEAT,GACJC,EAAKS,aAAc,EAAGV,GASvBC,EAAKU,SAAW,IAAIC,IAEfX,EAAKM,OAAOM,IAAK,SAAY,CAEjC,IAAMC,EAAcb,EAAKM,OAAOQ,IAAK,SACrCC,EAAcf,EAAKU,SAAUG,GAC7Bb,EAAKM,OAAOU,OAAQ,SA3CyB,OAoD9ChB,EAAKiB,QAAU,IAAIC,OAAWlB,EAAKJ,SAASuB,iBAEvCnB,EAAKM,OAAOM,IAAK,WAErBZ,EAAKiB,QAAQG,MAAOpB,EAAKM,OAAOQ,IAAK,UAErCd,EAAKM,OAAOU,OAAQ,UAUrBhB,EAAKqB,kBAAoB,IAAIC,IAS7BtB,EAAKuB,kCAAmC,EA7EMvB,iDAsF/C,WACC,OAAOG,KAAKK,UAAUgB,4BASvB,WACC,OAAiC,IAA1BrB,KAAKK,UAAUgB,oDAUvB,WACC,OAAOrB,KAAKoB,mDA0Bb,SAAIE,GAAoB,IAAd5B,EAAc6B,UAAAF,OAAA,QAAAG,IAAAD,UAAA,GAAAA,UAAA,GAAP,KAChB,OAAM7B,EAKEA,IAASM,KAAKN,OAAmB,YAAT4B,GAA+B,iBAATA,GAJrC,YAATA,GAA+B,iBAATA,GAEnB,SAATA,GAA4B,cAATA,0BAYtB,SAAUG,GACT,OAAOzB,KAAKK,UAAWoB,gCASxB,SAAeC,GACd,OAAO1B,KAAKK,UAAUsB,QAASD,8BAQhC,WACC,OAAO1B,KAAKK,UAAWuB,OAAOC,oEAQ/B,SAAAC,IAAA,OAAAC,mBAAAC,KAAA,SAAAC,GAAA,eAAAA,EAAAC,KAAAD,EAAAE,MAAA,YACMnC,KAAKO,SAAS6B,KAAO,GAD3B,CAAAH,EAAAE,KAAA,QAEE,OAFFF,EAAAE,KAAA,EAEQ,QAFR,UAKOnC,KAAKc,QAAQuB,QALpB,CAAAJ,EAAAE,KAAA,QAME,OANFF,EAAAE,KAAA,EAMQ,QANR,OASC,OAAAF,EAAAK,cAAOtC,KAAKG,OAAOoC,OAAnB,QATD,wBAAAN,EAAAO,SAAAV,EAAA9B,4DAoBA,SAAAyC,IAAA,OAAAV,mBAAAC,KAAA,SAAAU,GAAA,eAAAA,EAAAR,KAAAQ,EAAAP,MAAA,OACC,OAAAO,EAAAJ,cAAOtC,KAAKG,OAAOwC,UAAnB,QADD,YAGM3C,KAAKO,SAAS6B,KAAO,GAH3B,CAAAM,EAAAP,KAAA,QAIE,OAJFO,EAAAP,KAAA,GAIU,QAASnC,KAAK4C,aAAc,UAJtC,UAOO5C,KAAKc,QAAQuB,QAPpB,CAAAK,EAAAP,KAAA,QAQE,OARFO,EAAAP,KAAA,GAQU,QAASnC,KAAK4C,aAAc,UARtC,wBAAAF,EAAAF,SAAAC,EAAAzC,mCAkBA,SAAc6C,GACb,GAAY,SAAPA,EACJ,OAAK7C,KAAKO,SAAS6B,KAAO,EAClBtC,OAAAgD,EAAA,KAAAhD,CAAKE,KAAKO,UAAWwC,KAAM,UAGnC,EAGD,GAAY,SAAPF,EAAiB,CACrB,IAAMG,EAAchD,KAAKc,QAAQmC,WAEjC,MAAsB,IAAfD,OAAoBxB,EAAYwB,EAGxC,OAAOhD,KAAKG,OAAOQ,IAAKkC,+BASzB,SAAcA,GACb,MAAY,SAAPA,EACG7C,KAAKO,SAAS6B,KAAO,EAGjB,SAAPS,GACI7C,KAAKc,QAAQuB,QAGfrC,KAAKG,OAAOM,IAAKoC,4BAWzB,SAAWK,GACV,KAAQA,aAAwB1D,GAC/B,OAAO,EAIR,GAAKQ,OAASkD,EACb,OAAO,EAIR,GAAKlD,KAAKN,MAAQwD,EAAaxD,KAC9B,OAAO,EAIR,GAAKM,KAAKmD,iCAAmCD,EAAaC,gCACzD,OAAO,EAIR,GAAKnD,KAAKG,OAAOiC,OAASc,EAAa/C,OAAOiC,MAAQpC,KAAKO,SAAS6B,OAASc,EAAa3C,SAAS6B,MAClGpC,KAAKc,QAAQsB,OAASc,EAAapC,QAAQsB,KAC3C,OAAO,EAvBiB,IAAAgB,EAAAC,EAAAC,EA2BKtD,KAAKG,QA3BV,IA2BzB,IAAAkD,EAAAE,MAAAH,EAAAC,EAAAG,KAAAC,MAA4C,KAAAC,EAAA5D,OAAA6D,EAAA,KAAA7D,CAAAsD,EAAAQ,MAAA,GAA9Bf,EAA8Ba,EAAA,GAAzBE,EAAyBF,EAAA,GAC3C,IAAMR,EAAa/C,OAAOM,IAAKoC,IAASK,EAAa/C,OAAOQ,IAAKkC,KAAUe,EAC1E,OAAO,GA7BgB,MAAAC,GAAAR,EAAAS,EAAAD,GAAA,QAAAR,EAAAU,IAAA,IAAAC,EAAAC,EAAAX,EAkCAtD,KAAKO,UAlCL,IAkCzB,IAAA0D,EAAAV,MAAAS,EAAAC,EAAAT,KAAAC,MAAyC,KAA7BS,EAA6BF,EAAAJ,MACxC,IAAMV,EAAa3C,SAASE,IAAKyD,GAChC,OAAO,GApCgB,MAAAL,GAAAI,EAAAH,EAAAD,GAAA,QAAAI,EAAAF,IAAA,IAAAI,EAAAC,EAAAd,EAyCDtD,KAAKc,QAAQuD,iBAzCZ,IAyCzB,IAAAD,EAAAb,MAAAY,EAAAC,EAAAZ,KAAAC,MAAuD,KAA3Ca,EAA2CH,EAAAP,MACtD,IACEV,EAAapC,QAAQL,IAAK6D,IAC3BpB,EAAapC,QAAQyD,YAAaD,KAAetE,KAAKc,QAAQyD,YAAaD,GAE3E,OAAO,GA9CgB,MAAAT,GAAAO,EAAAN,EAAAD,GAAA,QAAAO,EAAAL,IAkDzB,OAAO,0BAYR,WAAyB,QAAAS,EAAAjD,UAAAF,OAAZ6C,EAAY,IAAAO,MAAAD,GAAAE,EAAA,EAAAA,EAAAF,EAAAE,IAAZR,EAAYQ,GAAAnD,UAAAmD,GACxB,QAAAC,EAAA,EAAAC,EAAoBV,EAApBS,EAAAC,EAAAvD,OAAAsD,IAAgC,CAA1B,IAAMjF,EAAIkF,EAAAD,GACf,IAAM3E,KAAKO,SAASE,IAAKf,GACxB,OAAO,EAIT,OAAO,+BAQR,WACC,OAAOM,KAAKO,SAASgC,+BA6BtB,SAAU+B,GACT,OAAOtE,KAAKc,QAAQyD,YAAaD,qCAiClC,SAAoBA,GACnB,OAAOtE,KAAKc,QAAQ+D,cAAeP,gCASpC,WAAgC,IAAjBQ,EAAiBvD,UAAAF,OAAA,QAAAG,IAAAD,UAAA,IAAAA,UAAA,GAC/B,OAAOvB,KAAKc,QAAQuD,cAAeS,2BAYpC,WAAwB,QAAAC,EAAAxD,UAAAF,OAAXiD,EAAW,IAAAG,MAAAM,GAAAC,EAAA,EAAAA,EAAAD,EAAAC,IAAXV,EAAWU,GAAAzD,UAAAyD,GACvB,QAAAC,EAAA,EAAAC,EAAoBZ,EAApBW,EAAAC,EAAA7D,OAAA4D,IAA+B,CAAzB,IAAMvF,EAAIwF,EAAAD,GACf,IAAMjF,KAAKc,QAAQL,IAAKf,GACvB,OAAO,EAIT,OAAO,8BAYR,WAA4B,QAAAyF,EAAA5D,UAAAF,OAAX+D,EAAW,IAAAX,MAAAU,GAAAE,EAAA,EAAAA,EAAAF,EAAAE,IAAXD,EAAWC,GAAA9D,UAAA8D,GAC3B,IAAMC,EAAUxF,OAAAyF,EAAA,KAAAzF,CAAI0F,OAAYJ,GAC5BK,EAASzF,KAAKyF,OAElB,MAAQA,EAAS,CAChB,GAAKH,EAAQI,MAAOD,GACnB,OAAOA,EAGRA,EAASA,EAAOA,OAGjB,OAAO,sCASR,SAAmB5C,GAClB,OAAO7C,KAAKkB,kBAAkBP,IAAKkC,8DASpC,SAAA8C,IAAA,OAAA5D,mBAAAC,KAAA,SAAA4D,GAAA,eAAAA,EAAA1D,KAAA0D,EAAAzD,MAAA,OACC,OAAAyD,EAAAtD,cAAOtC,KAAKkB,kBAAkByB,UAA9B,QADD,wBAAAiD,EAAApD,SAAAmD,EAAA3F,kCA2BA,WACC,IAAM6F,EAAUpB,MAAMqB,KAAM9F,KAAKO,UAAWwF,OAAOhD,KAAM,KACnDiD,EAAShG,KAAKc,QAAQmC,WACtBgD,EAAaxB,MAAMqB,KAAM9F,KAAKG,QAAS+F,IAAK,SAAAC,GAAC,SAAAC,OAAQD,EAAG,GAAX,MAAAC,OAAqBD,EAAG,GAAxB,OAAkCJ,OAAOhD,KAAM,KAElG,OAAO/C,KAAKN,MACE,IAAXmG,EAAgB,GAAhB,WAAAO,OAAiCP,EAAjC,OACCG,EAAD,WAAAI,OAA2BJ,EAA3B,KAAU,KACI,IAAdC,EAAmB,GAAnB,IAAAG,OAA6BH,0BAWjC,WAAuB,IAAfI,EAAe9E,UAAAF,OAAA,QAAAG,IAAAD,UAAA,IAAAA,UAAA,GAChB+E,KAEN,GAAKD,EAAO,KAAAE,EAAAC,EAAAlD,EACUtD,KAAKyG,eADf,IACX,IAAAD,EAAAjD,MAAAgD,EAAAC,EAAAhD,KAAAC,MAA0C,KAA9BiD,EAA8BH,EAAA3C,MACzC0C,EAAcK,KAAMD,EAAME,OAAQP,KAFxB,MAAAxC,GAAA2C,EAAA1C,EAAAD,GAAA,QAAA2C,EAAAzC,KAOZ,IAAM8C,EAAS,IAAI7G,KAAK8G,YAAa9G,KAAKP,SAAUO,KAAKN,KAAMM,KAAKG,OAAQmG,GAiB5E,OAbAO,EAAOtG,SAAW,IAAIC,IAAKR,KAAKO,UAChCsG,EAAO/F,QAAQiG,IAAK/G,KAAKc,QAAQ+D,iBAGjCgC,EAAO3F,kBAAoB,IAAIC,IAAKnB,KAAKkB,mBAKzC2F,EAAOG,gBAAkBhH,KAAKgH,gBAE9BH,EAAOzF,iCAAmCpB,KAAKmD,gCAExC0D,8BAaR,SAAcI,GACb,OAAOjH,KAAKM,aAAcN,KAAKkH,WAAYD,+BAc5C,SAAcxF,EAAOwF,GACpBjH,KAAKmH,YAAa,WAAYnH,MAC9B,IAF4BoH,EAExBC,EAAQ,EAENC,EAAQC,EAAWvH,KAAKP,SAAUwH,GAJZO,EAAAlE,EAMRgE,GANQ,IAM5B,IAAAE,EAAAjE,MAAA6D,EAAAI,EAAAhE,KAAAC,MAA4B,KAAhB/B,EAAgB0F,EAAAxD,MAEN,OAAhBlC,EAAK+D,QACT/D,EAAK+F,UAGN/F,EAAK+D,OAASzF,KACd0B,EAAKjC,SAAWO,KAAKP,SAErBO,KAAKK,UAAUqH,OAAQjG,EAAO,EAAGC,GACjCD,IACA4F,KAjB2B,MAAAxD,GAAA2D,EAAA1D,EAAAD,GAAA,QAAA2D,EAAAzD,IAoB5B,OAAOsD,iCAaR,SAAiB5F,GAAqB,IAAdkG,EAAcpG,UAAAF,OAAA,QAAAG,IAAAD,UAAA,GAAAA,UAAA,GAAJ,EACjCvB,KAAKmH,YAAa,WAAYnH,MAE9B,IAAM,IAAImG,EAAI1E,EAAO0E,EAAI1E,EAAQkG,EAASxB,IACzCnG,KAAKK,UAAW8F,GAAIV,OAAS,KAG9B,OAAOzF,KAAKK,UAAUqH,OAAQjG,EAAOkG,gCAYtC,SAAe9E,EAAKe,GACnBA,EAAQgE,OAAQhE,GAEhB5D,KAAKmH,YAAa,aAAcnH,MAEpB,SAAP6C,EACJjC,EAAcZ,KAAKO,SAAUqD,GACX,SAAPf,EACX7C,KAAKc,QAAQG,MAAO2C,GAEpB5D,KAAKG,OAAO4G,IAAKlE,EAAKe,mCAaxB,SAAkBf,GAIjB,OAHA7C,KAAKmH,YAAa,aAAcnH,MAGpB,SAAP6C,EACC7C,KAAKO,SAAS6B,KAAO,IACzBpC,KAAKO,SAASsH,SAEP,GAOG,SAAPhF,GACE7C,KAAKc,QAAQuB,UAClBrC,KAAKc,QAAQ+G,SAEN,GAOF7H,KAAKG,OAAOU,OAAQgC,4BAc5B,SAAWqB,GACVlE,KAAKmH,YAAa,aAAcnH,MADV,IAAA8H,EAAAC,EAAAzE,EAGF0E,eAAS9D,IAHP,IAGtB,IAAA6D,EAAAxE,MAAAuE,EAAAC,EAAAvE,KAAAC,MAA2C,KAA/B/D,EAA+BoI,EAAAlE,MAC1C5D,KAAKO,SAAS0H,IAAKvI,IAJE,MAAAmE,GAAAkE,EAAAjE,EAAAD,GAAA,QAAAkE,EAAAhE,iCAmBvB,SAAcG,GACblE,KAAKmH,YAAa,aAAcnH,MADP,IAAAkI,EAAAC,EAAA7E,EAGL0E,eAAS9D,IAHJ,IAGzB,IAAAiE,EAAA5E,MAAA2E,EAAAC,EAAA3E,KAAAC,MAA2C,KAA/B/D,EAA+BwI,EAAAtE,MAC1C5D,KAAKO,SAASM,OAAQnB,IAJE,MAAAmE,GAAAsE,EAAArE,EAAAD,GAAA,QAAAsE,EAAApE,8BA2B1B,SAAWO,EAAUV,GACpB5D,KAAKmH,YAAa,aAAcnH,MAEhCA,KAAKc,QAAQiG,IAAKzC,EAAUV,+BAkB7B,SAAcU,GACbtE,KAAKmH,YAAa,aAAcnH,MADR,IAAAoI,EAAAC,EAAA/E,EAGJ0E,eAAS1D,IAHL,IAGxB,IAAA+D,EAAA9E,MAAA6E,EAAAC,EAAA7E,KAAAC,MAA0C,KAA9B/D,EAA8B0I,EAAAxE,MACzC5D,KAAKc,QAAQwH,OAAQ5I,IAJE,MAAAmE,GAAAwE,EAAAvE,EAAAD,GAAA,QAAAwE,EAAAtE,uCAiBzB,SAAoBlB,EAAKe,GACxB5D,KAAKkB,kBAAkB6F,IAAKlE,EAAKe,wCAWlC,SAAuBf,GACtB,OAAO7C,KAAKkB,kBAAkBL,OAAQgC,UApyBH0F,QA+0BrC,SAASnI,EAAiBT,GACzBA,EAAQ6I,eAAO7I,GADkB,IAAA8I,EAAAC,EAAApF,EAGH3D,GAHG,IAGjC,IAAA+I,EAAAnF,MAAAkF,EAAAC,EAAAlF,KAAAC,MAAsC,KAAAkF,EAAA7I,OAAA6D,EAAA,KAAA7D,CAAA2I,EAAA7E,MAAA,GAAxBf,EAAwB8F,EAAA,GAAnB/E,EAAmB+E,EAAA,GACtB,OAAV/E,EACJjE,EAAMkB,OAAQgC,GACa,iBAATe,GAClBjE,EAAMoH,IAAKlE,EAAK+E,OAAQhE,KAPO,MAAAC,GAAA6E,EAAA5E,EAAAD,GAAA,QAAA6E,EAAA3E,IAWjC,OAAOpE,EAQR,SAASiB,EAAcgI,EAAYC,GAClC,IAAMC,EAAaD,EAAcE,MAAO,OACxCH,EAAWf,QACXiB,EAAWE,QAAS,SAAAtJ,GAAI,OAAIkJ,EAAWX,IAAKvI,KAO7C,SAAS6H,EAAW9H,EAAU6H,GAE7B,MAAqB,iBAATA,GACF,IAAI2B,OAAMxJ,EAAU6H,KAGxB4B,eAAY5B,KACjBA,GAAUA,IAIJ7C,MAAMqB,KAAMwB,GACjBpB,IAAK,SAAAxE,GACL,MAAoB,iBAARA,EACJ,IAAIuH,OAAMxJ,EAAUiC,GAGvBA,aAAgByH,OACb,IAAIF,OAAMxJ,EAAUiC,EAAK0H,MAG1B1H","file":"js/chunk-2d0bd5d7.c0e63c2c.js","sourcesContent":["/**\n * @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/element\n */\n\nimport Node from './node';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport toMap from '@ckeditor/ckeditor5-utils/src/tomap';\nimport toArray from '@ckeditor/ckeditor5-utils/src/toarray';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport Matcher from './matcher';\nimport StylesMap from './stylesmap';\n\n// @if CK_DEBUG_ENGINE // const { convertMapToTags } = require( '../dev-utils/utils' );\n\n/**\n * View element.\n *\n * The editing engine does not define a fixed semantics of its elements (it is \"DTD-free\").\n * This is why the type of the {@link module:engine/view/element~Element} need to\n * be defined by the feature developer. When creating an element you should use one of the following methods:\n *\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createContainerElement `downcastWriter#createContainerElement()`}\n * in order to create a {@link module:engine/view/containerelement~ContainerElement},\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createAttributeElement `downcastWriter#createAttributeElement()`}\n * in order to create a {@link module:engine/view/attributeelement~AttributeElement},\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createEmptyElement `downcastWriter#createEmptyElement()`}\n * in order to create a {@link module:engine/view/emptyelement~EmptyElement}.\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createUIElement `downcastWriter#createUIElement()`}\n * in order to create a {@link module:engine/view/uielement~UIElement}.\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createEditableElement `downcastWriter#createEditableElement()`}\n * in order to create a {@link module:engine/view/editableelement~EditableElement}.\n *\n * Note that for view elements which are not created from the model, like elements from mutations, paste or\n * {@link module:engine/controller/datacontroller~DataController#set data.set} it is not possible to define the type of the element.\n * In such cases the {@link module:engine/view/upcastwriter~UpcastWriter#createElement `UpcastWriter#createElement()`} method\n * should be used to create generic view elements.\n *\n * @extends module:engine/view/node~Node\n */\nexport default class Element extends Node {\n\t/**\n\t * Creates a view element.\n\t *\n\t * Attributes can be passed in various formats:\n\t *\n\t *\t\tnew Element( viewDocument, 'div', { class: 'editor', contentEditable: 'true' } ); // object\n\t *\t\tnew Element( viewDocument, 'div', [ [ 'class', 'editor' ], [ 'contentEditable', 'true' ] ] ); // map-like iterator\n\t *\t\tnew Element( viewDocument, 'div', mapOfAttributes ); // map\n\t *\n\t * @protected\n\t * @param {module:engine/view/document~Document} document The document instance to which this element belongs.\n\t * @param {String} name Node name.\n\t * @param {Object|Iterable} [attrs] Collection of attributes.\n\t * @param {module:engine/view/node~Node|Iterable.<module:engine/view/node~Node>} [children]\n\t * A list of nodes to be inserted into created element.\n\t */\n\tconstructor( document, name, attrs, children ) {\n\t\tsuper( document );\n\n\t\t/**\n\t\t * Name of the element.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * Map of attributes, where attributes names are keys and attributes values are values.\n\t\t *\n\t\t * @protected\n\t\t * @member {Map} #_attrs\n\t\t */\n\t\tthis._attrs = parseAttributes( attrs );\n\n\t\t/**\n\t\t * Array of child nodes.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.<module:engine/view/node~Node>}\n\t\t */\n\t\tthis._children = [];\n\n\t\tif ( children ) {\n\t\t\tthis._insertChild( 0, children );\n\t\t}\n\n\t\t/**\n\t\t * Set of classes associated with element instance.\n\t\t *\n\t\t * @protected\n\t\t * @member {Set}\n\t\t */\n\t\tthis._classes = new Set();\n\n\t\tif ( this._attrs.has( 'class' ) ) {\n\t\t\t// Remove class attribute and handle it by class set.\n\t\t\tconst classString = this._attrs.get( 'class' );\n\t\t\tparseClasses( this._classes, classString );\n\t\t\tthis._attrs.delete( 'class' );\n\t\t}\n\n\t\t/**\n\t\t * Normalized styles.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:engine/view/stylesmap~StylesMap} module:engine/view/element~Element#_styles\n\t\t */\n\t\tthis._styles = new StylesMap( this.document.stylesProcessor );\n\n\t\tif ( this._attrs.has( 'style' ) ) {\n\t\t\t// Remove style attribute and handle it by styles map.\n\t\t\tthis._styles.setTo( this._attrs.get( 'style' ) );\n\n\t\t\tthis._attrs.delete( 'style' );\n\t\t}\n\n\t\t/**\n\t\t * Map of custom properties.\n\t\t * Custom properties can be added to element instance, will be cloned but not rendered into DOM.\n\t\t *\n\t\t * @protected\n\t\t * @member {Map}\n\t\t */\n\t\tthis._customProperties = new Map();\n\n\t\t/**\n\t\t * Whether an element is allowed inside an AttributeElement and can be wrapped with\n\t\t * {@link module:engine/view/attributeelement~AttributeElement} by {@link module:engine/view/downcastwriter~DowncastWriter}.\n\t\t *\n\t\t * @protected\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._isAllowedInsideAttributeElement = false;\n\t}\n\n\t/**\n\t * Number of element's children.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget childCount() {\n\t\treturn this._children.length;\n\t}\n\n\t/**\n\t * Is `true` if there are no nodes inside this element, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this._children.length === 0;\n\t}\n\n\t/**\n\t * Whether the element is allowed inside an AttributeElement and can be wrapped with\n\t * {@link module:engine/view/attributeelement~AttributeElement} by {@link module:engine/view/downcastwriter~DowncastWriter}.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isAllowedInsideAttributeElement() {\n\t\treturn this._isAllowedInsideAttributeElement;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\telement.is( 'element' ); // -> true\n\t *\t\telement.is( 'node' ); // -> true\n\t *\t\telement.is( 'view:element' ); // -> true\n\t *\t\telement.is( 'view:node' ); // -> true\n\t *\n\t *\t\telement.is( 'model:element' ); // -> false\n\t *\t\telement.is( 'documentSelection' ); // -> false\n\t *\n\t * Assuming that the object being checked is an element, you can also check its\n\t * {@link module:engine/view/element~Element#name name}:\n\t *\n\t *\t\telement.is( 'element', 'img' ); // -> true if this is an <img> element\n\t *\t\ttext.is( 'element', 'img' ); -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type Type to check.\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type === 'element' || type === 'view:element' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'node' || type === 'view:node';\n\t\t} else {\n\t\t\treturn name === this.name && ( type === 'element' || type === 'view:element' );\n\t\t}\n\t}\n\n\t/**\n\t * Gets child at the given index.\n\t *\n\t * @param {Number} index Index of child.\n\t * @returns {module:engine/view/node~Node} Child node.\n\t */\n\tgetChild( index ) {\n\t\treturn this._children[ index ];\n\t}\n\n\t/**\n\t * Gets index of the given child node. Returns `-1` if child node is not found.\n\t *\n\t * @param {module:engine/view/node~Node} node Child node.\n\t * @returns {Number} Index of the child node.\n\t */\n\tgetChildIndex( node ) {\n\t\treturn this._children.indexOf( node );\n\t}\n\n\t/**\n\t * Gets child nodes iterator.\n\t *\n\t * @returns {Iterable.<module:engine/view/node~Node>} Child nodes iterator.\n\t */\n\tgetChildren() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Returns an iterator that contains the keys for attributes. Order of inserting attributes is not preserved.\n\t *\n\t * @returns {Iterable.<String>} Keys for attributes.\n\t */\n\t* getAttributeKeys() {\n\t\tif ( this._classes.size > 0 ) {\n\t\t\tyield 'class';\n\t\t}\n\n\t\tif ( !this._styles.isEmpty ) {\n\t\t\tyield 'style';\n\t\t}\n\n\t\tyield* this._attrs.keys();\n\t}\n\n\t/**\n\t * Returns iterator that iterates over this element's attributes.\n\t *\n\t * Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.\n\t * This format is accepted by native `Map` object and also can be passed in `Node` constructor.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t* getAttributes() {\n\t\tyield* this._attrs.entries();\n\n\t\tif ( this._classes.size > 0 ) {\n\t\t\tyield [ 'class', this.getAttribute( 'class' ) ];\n\t\t}\n\n\t\tif ( !this._styles.isEmpty ) {\n\t\t\tyield [ 'style', this.getAttribute( 'style' ) ];\n\t\t}\n\t}\n\n\t/**\n\t * Gets attribute by key. If attribute is not present - returns undefined.\n\t *\n\t * @param {String} key Attribute key.\n\t * @returns {String|undefined} Attribute value.\n\t */\n\tgetAttribute( key ) {\n\t\tif ( key == 'class' ) {\n\t\t\tif ( this._classes.size > 0 ) {\n\t\t\t\treturn [ ...this._classes ].join( ' ' );\n\t\t\t}\n\n\t\t\treturn undefined;\n\t\t}\n\n\t\tif ( key == 'style' ) {\n\t\t\tconst inlineStyle = this._styles.toString();\n\n\t\t\treturn inlineStyle == '' ? undefined : inlineStyle;\n\t\t}\n\n\t\treturn this._attrs.get( key );\n\t}\n\n\t/**\n\t * Returns a boolean indicating whether an attribute with the specified key exists in the element.\n\t *\n\t * @param {String} key Attribute key.\n\t * @returns {Boolean} `true` if attribute with the specified key exists in the element, false otherwise.\n\t */\n\thasAttribute( key ) {\n\t\tif ( key == 'class' ) {\n\t\t\treturn this._classes.size > 0;\n\t\t}\n\n\t\tif ( key == 'style' ) {\n\t\t\treturn !this._styles.isEmpty;\n\t\t}\n\n\t\treturn this._attrs.has( key );\n\t}\n\n\t/**\n\t * Checks if this element is similar to other element.\n\t * Both elements should have the same name and attributes to be considered as similar. Two similar elements\n\t * can contain different set of children nodes.\n\t *\n\t * @param {module:engine/view/element~Element} otherElement\n\t * @returns {Boolean}\n\t */\n\tisSimilar( otherElement ) {\n\t\tif ( !( otherElement instanceof Element ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// If exactly the same Element is provided - return true immediately.\n\t\tif ( this === otherElement ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Check element name.\n\t\tif ( this.name != otherElement.name ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check isAllowedInsideAttributeElement property.\n\t\tif ( this.isAllowedInsideAttributeElement != otherElement.isAllowedInsideAttributeElement ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check number of attributes, classes and styles.\n\t\tif ( this._attrs.size !== otherElement._attrs.size || this._classes.size !== otherElement._classes.size ||\n\t\t\tthis._styles.size !== otherElement._styles.size ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if attributes are the same.\n\t\tfor ( const [ key, value ] of this._attrs ) {\n\t\t\tif ( !otherElement._attrs.has( key ) || otherElement._attrs.get( key ) !== value ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if classes are the same.\n\t\tfor ( const className of this._classes ) {\n\t\t\tif ( !otherElement._classes.has( className ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if styles are the same.\n\t\tfor ( const property of this._styles.getStyleNames() ) {\n\t\t\tif (\n\t\t\t\t!otherElement._styles.has( property ) ||\n\t\t\t\totherElement._styles.getAsString( property ) !== this._styles.getAsString( property )\n\t\t\t) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns true if class is present.\n\t * If more then one class is provided - returns true only when all classes are present.\n\t *\n\t *\t\telement.hasClass( 'foo' ); // Returns true if 'foo' class is present.\n\t *\t\telement.hasClass( 'foo', 'bar' ); // Returns true if 'foo' and 'bar' classes are both present.\n\t *\n\t * @param {...String} className\n\t */\n\thasClass( ...className ) {\n\t\tfor ( const name of className ) {\n\t\t\tif ( !this._classes.has( name ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns iterator that contains all class names.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetClassNames() {\n\t\treturn this._classes.keys();\n\t}\n\n\t/**\n\t * Returns style value for the given property mae.\n\t * If the style does not exist `undefined` is returned.\n\t *\n\t * **Note**: This method can work with normalized style names if\n\t * {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.\n\t * See {@link module:engine/view/stylesmap~StylesMap#getAsString `StylesMap#getAsString()`} for details.\n\t *\n\t * For an element with style set to `'margin:1px'`:\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tconst element = view.change( writer => {\n\t *\t\t\tconst element = writer.createElement();\n\t *\t\t\twriter.setStyle( 'margin', '1px' );\n\t *\t\t\twriter.setStyle( 'margin-bottom', '3em' );\n\t *\n\t *\t\t\treturn element;\n\t *\t\t} );\n\t *\n\t *\t\telement.getStyle( 'margin' ); // -> 'margin: 1px 1px 3em;'\n\t *\n\t * @param {String} property\n\t * @returns {String|undefined}\n\t */\n\tgetStyle( property ) {\n\t\treturn this._styles.getAsString( property );\n\t}\n\n\t/**\n\t * Returns a normalized style object or single style value.\n\t *\n\t * For an element with style set to: margin:1px 2px 3em;\n\t *\n\t *\t\telement.getNormalizedStyle( 'margin' ) );\n\t *\n\t * will return:\n\t *\n\t *\t\t{\n\t *\t\t\ttop: '1px',\n\t *\t\t\tright: '2px',\n\t *\t\t\tbottom: '3em',\n\t *\t\t\tleft: '2px'    // a normalized value from margin shorthand\n\t *\t\t}\n\t *\n\t * and reading for single style value:\n\t *\n\t *\t\tstyles.getNormalizedStyle( 'margin-left' );\n\t *\n\t * Will return a `2px` string.\n\t *\n\t * **Note**: This method will return normalized values only if\n\t * {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.\n\t * See {@link module:engine/view/stylesmap~StylesMap#getNormalized `StylesMap#getNormalized()`} for details.\n\t *\n\t *\n\t * @param {String} property Name of CSS property\n\t * @returns {Object|String|undefined}\n\t */\n\tgetNormalizedStyle( property ) {\n\t\treturn this._styles.getNormalized( property );\n\t}\n\n\t/**\n\t * Returns iterator that contains all style names.\n\t *\n\t * @param {Boolean} [expand=false] Expand shorthand style properties and return all equivalent style representations.\n\t * @returns {Iterable.<String>}\n\t */\n\tgetStyleNames( expand = false ) {\n\t\treturn this._styles.getStyleNames( expand );\n\t}\n\n\t/**\n\t * Returns true if style keys are present.\n\t * If more then one style property is provided - returns true only when all properties are present.\n\t *\n\t *\t\telement.hasStyle( 'color' ); // Returns true if 'border-top' style is present.\n\t *\t\telement.hasStyle( 'color', 'border-top' ); // Returns true if 'color' and 'border-top' styles are both present.\n\t *\n\t * @param {...String} property\n\t */\n\thasStyle( ...property ) {\n\t\tfor ( const name of property ) {\n\t\t\tif ( !this._styles.has( name ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns ancestor element that match specified pattern.\n\t * Provided patterns should be compatible with {@link module:engine/view/matcher~Matcher Matcher} as it is used internally.\n\t *\n\t * @see module:engine/view/matcher~Matcher\n\t * @param {Object|String|RegExp|Function} patterns Patterns used to match correct ancestor.\n\t * See {@link module:engine/view/matcher~Matcher}.\n\t * @returns {module:engine/view/element~Element|null} Found element or `null` if no matching ancestor was found.\n\t */\n\tfindAncestor( ...patterns ) {\n\t\tconst matcher = new Matcher( ...patterns );\n\t\tlet parent = this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tif ( matcher.match( parent ) ) {\n\t\t\t\treturn parent;\n\t\t\t}\n\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns the custom property value for the given key.\n\t *\n\t * @param {String|Symbol} key\n\t * @returns {*}\n\t */\n\tgetCustomProperty( key ) {\n\t\treturn this._customProperties.get( key );\n\t}\n\n\t/**\n\t * Returns an iterator which iterates over this element's custom properties.\n\t * Iterator provides `[ key, value ]` pairs for each stored property.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t* getCustomProperties() {\n\t\tyield* this._customProperties.entries();\n\t}\n\n\t/**\n\t * Returns identity string based on element's name, styles, classes and other attributes.\n\t * Two elements that {@link #isSimilar are similar} will have same identity string.\n\t * It has the following format:\n\t *\n\t *\t\t'name class=\"class1,class2\" style=\"style1:value1;style2:value2\" attr1=\"val1\" attr2=\"val2\"'\n \t *\n\t * For example:\n\t *\n\t *\t\tconst element = writer.createContainerElement( 'foo', {\n\t *\t\t\tbanana: '10',\n\t *\t\t\tapple: '20',\n\t *\t\t\tstyle: 'color: red; border-color: white;',\n\t *\t\t\tclass: 'baz'\n\t *\t\t} );\n\t *\n\t *\t\t// returns 'foo class=\"baz\" style=\"border-color:white;color:red\" apple=\"20\" banana=\"10\"'\n\t *\t\telement.getIdentity();\n\t *\n\t * **Note**: Classes, styles and other attributes are sorted alphabetically.\n\t *\n\t * @returns {String}\n\t */\n\tgetIdentity() {\n\t\tconst classes = Array.from( this._classes ).sort().join( ',' );\n\t\tconst styles = this._styles.toString();\n\t\tconst attributes = Array.from( this._attrs ).map( i => `${ i[ 0 ] }=\"${ i[ 1 ] }\"` ).sort().join( ' ' );\n\n\t\treturn this.name +\n\t\t\t( classes == '' ? '' : ` class=\"${ classes }\"` ) +\n\t\t\t( !styles ? '' : ` style=\"${ styles }\"` ) +\n\t\t\t( attributes == '' ? '' : ` ${ attributes }` );\n\t}\n\n\t/**\n\t * Clones provided element.\n\t *\n\t * @protected\n\t * @param {Boolean} [deep=false] If set to `true` clones element and all its children recursively. When set to `false`,\n\t * element will be cloned without any children.\n\t * @returns {module:engine/view/element~Element} Clone of this element.\n\t */\n\t_clone( deep = false ) {\n\t\tconst childrenClone = [];\n\n\t\tif ( deep ) {\n\t\t\tfor ( const child of this.getChildren() ) {\n\t\t\t\tchildrenClone.push( child._clone( deep ) );\n\t\t\t}\n\t\t}\n\n\t\t// ContainerElement and AttributeElement should be also cloned properly.\n\t\tconst cloned = new this.constructor( this.document, this.name, this._attrs, childrenClone );\n\n\t\t// Classes and styles are cloned separately - this solution is faster than adding them back to attributes and\n\t\t// parse once again in constructor.\n\t\tcloned._classes = new Set( this._classes );\n\t\tcloned._styles.set( this._styles.getNormalized() );\n\n\t\t// Clone custom properties.\n\t\tcloned._customProperties = new Map( this._customProperties );\n\n\t\t// Clone filler offset method.\n\t\t// We can't define this method in a prototype because it's behavior which\n\t\t// is changed by e.g. toWidget() function from ckeditor5-widget. Perhaps this should be one of custom props.\n\t\tcloned.getFillerOffset = this.getFillerOffset;\n\n\t\tcloned._isAllowedInsideAttributeElement = this.isAllowedInsideAttributeElement;\n\n\t\treturn cloned;\n\t}\n\n\t/**\n\t * {@link module:engine/view/element~Element#_insertChild Insert} a child node or a list of child nodes at the end of this node\n\t * and sets the parent of these nodes to this element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#insert\n\t * @protected\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Number} Number of appended nodes.\n\t */\n\t_appendChild( items ) {\n\t\treturn this._insertChild( this.childCount, items );\n\t}\n\n\t/**\n\t * Inserts a child node or a list of child nodes on the given index and sets the parent of these nodes to\n\t * this element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#insert\n\t * @protected\n\t * @param {Number} index Position where nodes should be inserted.\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Number} Number of inserted nodes.\n\t */\n\t_insertChild( index, items ) {\n\t\tthis._fireChange( 'children', this );\n\t\tlet count = 0;\n\n\t\tconst nodes = normalize( this.document, items );\n\n\t\tfor ( const node of nodes ) {\n\t\t\t// If node that is being added to this element is already inside another element, first remove it from the old parent.\n\t\t\tif ( node.parent !== null ) {\n\t\t\t\tnode._remove();\n\t\t\t}\n\n\t\t\tnode.parent = this;\n\t\t\tnode.document = this.document;\n\n\t\t\tthis._children.splice( index, 0, node );\n\t\t\tindex++;\n\t\t\tcount++;\n\t\t}\n\n\t\treturn count;\n\t}\n\n\t/**\n\t * Removes number of child nodes starting at the given index and set the parent of these nodes to `null`.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#remove\n\t * @protected\n\t * @param {Number} index Number of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Array.<module:engine/view/node~Node>} The array of removed nodes.\n\t */\n\t_removeChildren( index, howMany = 1 ) {\n\t\tthis._fireChange( 'children', this );\n\n\t\tfor ( let i = index; i < index + howMany; i++ ) {\n\t\t\tthis._children[ i ].parent = null;\n\t\t}\n\n\t\treturn this._children.splice( index, howMany );\n\t}\n\n\t/**\n\t * Adds or overwrite attribute with a specified key and value.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#setAttribute\n\t * @protected\n\t * @param {String} key Attribute key.\n\t * @param {String} value Attribute value.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_setAttribute( key, value ) {\n\t\tvalue = String( value );\n\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tif ( key == 'class' ) {\n\t\t\tparseClasses( this._classes, value );\n\t\t} else if ( key == 'style' ) {\n\t\t\tthis._styles.setTo( value );\n\t\t} else {\n\t\t\tthis._attrs.set( key, value );\n\t\t}\n\t}\n\n\t/**\n\t * Removes attribute from the element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#removeAttribute\n\t * @protected\n\t * @param {String} key Attribute key.\n\t * @returns {Boolean} Returns true if an attribute existed and has been removed.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeAttribute( key ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\t// Remove class attribute.\n\t\tif ( key == 'class' ) {\n\t\t\tif ( this._classes.size > 0 ) {\n\t\t\t\tthis._classes.clear();\n\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\treturn false;\n\t\t}\n\n\t\t// Remove style attribute.\n\t\tif ( key == 'style' ) {\n\t\t\tif ( !this._styles.isEmpty ) {\n\t\t\t\tthis._styles.clear();\n\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\treturn false;\n\t\t}\n\n\t\t// Remove other attributes.\n\t\treturn this._attrs.delete( key );\n\t}\n\n\t/**\n\t * Adds specified class.\n\t *\n\t *\t\telement._addClass( 'foo' ); // Adds 'foo' class.\n\t *\t\telement._addClass( [ 'foo', 'bar' ] ); // Adds 'foo' and 'bar' classes.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#addClass\n\t * @protected\n\t * @param {Array.<String>|String} className\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_addClass( className ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tfor ( const name of toArray( className ) ) {\n\t\t\tthis._classes.add( name );\n\t\t}\n\t}\n\n\t/**\n\t * Removes specified class.\n\t *\n\t *\t\telement._removeClass( 'foo' );  // Removes 'foo' class.\n\t *\t\telement._removeClass( [ 'foo', 'bar' ] ); // Removes both 'foo' and 'bar' classes.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#removeClass\n\t * @protected\n\t * @param {Array.<String>|String} className\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeClass( className ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tfor ( const name of toArray( className ) ) {\n\t\t\tthis._classes.delete( name );\n\t\t}\n\t}\n\n\t/**\n\t * Adds style to the element.\n\t *\n\t *\t\telement._setStyle( 'color', 'red' );\n\t *\t\telement._setStyle( {\n\t *\t\t\tcolor: 'red',\n\t *\t\t\tposition: 'fixed'\n\t *\t\t} );\n\t *\n\t * **Note**: This method can work with normalized style names if\n\t * {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.\n\t * See {@link module:engine/view/stylesmap~StylesMap#set `StylesMap#set()`} for details.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#setStyle\n\t * @protected\n\t * @param {String|Object} property Property name or object with key - value pairs.\n\t * @param {String} [value] Value to set. This parameter is ignored if object is provided as the first parameter.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_setStyle( property, value ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tthis._styles.set( property, value );\n\t}\n\n\t/**\n\t * Removes specified style.\n\t *\n\t *\t\telement._removeStyle( 'color' );  // Removes 'color' style.\n\t *\t\telement._removeStyle( [ 'color', 'border-top' ] ); // Removes both 'color' and 'border-top' styles.\n\t *\n\t * **Note**: This method can work with normalized style names if\n\t * {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.\n\t * See {@link module:engine/view/stylesmap~StylesMap#remove `StylesMap#remove()`} for details.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#removeStyle\n\t * @protected\n\t * @param {Array.<String>|String} property\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeStyle( property ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tfor ( const name of toArray( property ) ) {\n\t\t\tthis._styles.remove( name );\n\t\t}\n\t}\n\n\t/**\n\t * Sets a custom property. Unlike attributes, custom properties are not rendered to the DOM,\n\t * so they can be used to add special data to elements.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#setCustomProperty\n\t * @protected\n\t * @param {String|Symbol} key\n\t * @param {*} value\n\t */\n\t_setCustomProperty( key, value ) {\n\t\tthis._customProperties.set( key, value );\n\t}\n\n\t/**\n\t * Removes the custom property stored under the given key.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#removeCustomProperty\n\t * @protected\n\t * @param {String|Symbol} key\n\t * @returns {Boolean} Returns true if property was removed.\n\t */\n\t_removeCustomProperty( key ) {\n\t\treturn this._customProperties.delete( key );\n\t}\n\n\t/**\n\t * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n\t *\n\t * @abstract\n\t * @method module:engine/view/element~Element#getFillerOffset\n\t */\n\n\t// @if CK_DEBUG_ENGINE // printTree( level = 0) {\n\t// @if CK_DEBUG_ENGINE // \tlet string = '';\n\n\t// @if CK_DEBUG_ENGINE //\tstring += '\\t'.repeat( level ) + `<${ this.name }${ convertMapToTags( this.getAttributes() ) }>`;\n\n\t// @if CK_DEBUG_ENGINE //\tfor ( const child of this.getChildren() ) {\n\t// @if CK_DEBUG_ENGINE //\t\tif ( child.is( '$text' ) ) {\n\t// @if CK_DEBUG_ENGINE //\t\t\tstring += '\\n' + '\\t'.repeat( level + 1 ) + child.data;\n\t// @if CK_DEBUG_ENGINE //\t\t} else {\n\t// @if CK_DEBUG_ENGINE //\t\t\tstring += '\\n' + child.printTree( level + 1 );\n\t// @if CK_DEBUG_ENGINE //\t\t}\n\t// @if CK_DEBUG_ENGINE //\t}\n\n\t// @if CK_DEBUG_ENGINE //\tif ( this.childCount ) {\n\t// @if CK_DEBUG_ENGINE //\t\tstring += '\\n' + '\\t'.repeat( level );\n\t// @if CK_DEBUG_ENGINE //\t}\n\n\t// @if CK_DEBUG_ENGINE //\tstring += `</${ this.name }>`;\n\n\t// @if CK_DEBUG_ENGINE //\treturn string;\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // logTree() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( this.printTree() );\n\t// @if CK_DEBUG_ENGINE // }\n}\n\n// Parses attributes provided to the element constructor before they are applied to an element. If attributes are passed\n// as an object (instead of `Iterable`), the object is transformed to the map. Attributes with `null` value are removed.\n// Attributes with non-`String` value are converted to `String`.\n//\n// @param {Object|Iterable} attrs Attributes to parse.\n// @returns {Map} Parsed attributes.\nfunction parseAttributes( attrs ) {\n\tattrs = toMap( attrs );\n\n\tfor ( const [ key, value ] of attrs ) {\n\t\tif ( value === null ) {\n\t\t\tattrs.delete( key );\n\t\t} else if ( typeof value != 'string' ) {\n\t\t\tattrs.set( key, String( value ) );\n\t\t}\n\t}\n\n\treturn attrs;\n}\n\n// Parses class attribute and puts all classes into classes set.\n// Classes set s cleared before insertion.\n//\n// @param {Set.<String>} classesSet Set to insert parsed classes.\n// @param {String} classesString String with classes to parse.\nfunction parseClasses( classesSet, classesString ) {\n\tconst classArray = classesString.split( /\\s+/ );\n\tclassesSet.clear();\n\tclassArray.forEach( name => classesSet.add( name ) );\n}\n\n// Converts strings to Text and non-iterables to arrays.\n//\n// @param {String|module:engine/view/item~Item|Iterable.<String|module:engine/view/item~Item>}\n// @returns {Iterable.<module:engine/view/node~Node>}\nfunction normalize( document, nodes ) {\n\t// Separate condition because string is iterable.\n\tif ( typeof nodes == 'string' ) {\n\t\treturn [ new Text( document, nodes ) ];\n\t}\n\n\tif ( !isIterable( nodes ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Array.from to enable .map() on non-arrays.\n\treturn Array.from( nodes )\n\t\t.map( node => {\n\t\t\tif ( typeof node == 'string' ) {\n\t\t\t\treturn new Text( document, node );\n\t\t\t}\n\n\t\t\tif ( node instanceof TextProxy ) {\n\t\t\t\treturn new Text( document, node.data );\n\t\t\t}\n\n\t\t\treturn node;\n\t\t} );\n}\n"],"sourceRoot":""}