TPE DOM/Custom elements

Introduction

This project is to enable web authors to define and use new types of DOM elements in a document.

References:

• Custom Elements spec
• whatwg html wiki
• whatwg dom wiki
• blink-dev intent-to-implement
• Blink bugs
  • https://bugs.chromium.org/p/chromium/issues/detail?id=594918
• Safari bugs
  • https://bugs.webkit.org/show_bug.cgi?id=154907
  • https://bugs.webkit.org/show_bug.cgi?id=150225
  • https://bugs.webkit.org/show_bug.cgi?id=155108

Taipei Main Members

Engineers: Edgar Chen, Jocelyn Liu, John Dai

Meeting Minutes

Sync-up minutes

High-level Roadmap

[Stage 1] <We are here!>

1. Remove support of SVG-based custom element.
   • Bug: 1274505
2. Window interface
   • Separate control preference
   • Move mRegistry from document to window.customElements
   • Bugs: 1275833, 1275832, 1275838, 1275839
3. HTMLElement constructor
   • Support using ES6 classes
   • Construction stack
   • Bug: 1274159
4. Document interface
   • createElement, createElementNS
   • Bug: 1276579
5. window.customElements.define
   • Bug: 1275835

[Stage 2]

1. custom element reactions stack/queue
   • Callback reaction
   • sProcessingStack
   • EnqueueLifecycleCallback
   • Upgrade reaction
2. Lifecycle callbacks
   • connectedCallback
   • disconnectedCallback
   • attributeChangedCallback
3. Algorithm of creating an element
   • Spec: https://dom.spec.whatwg.org/#concept-create-element
   • Revise consumers (createElement[NS] and HTML parser accordingly
     • HTML parser: https://dxr.mozilla.org/mozilla-central/source/parser/html/nsHtml5TreeOperation.cpp#335

[Stage 3]

1. Mutation algorithms (Shadow dom)
   • Spec:
     • https://dom.spec.whatwg.org/#mutation-algorithms
     • https://w3c.github.io/webcomponents/spec/custom/#dom-mutation-algorithms
2. Web-platform-tests
   • https://bugzilla.mozilla.org/show_bug.cgi?id=1234886

[Stage 4]

1. CSS :define
   • https://bugzilla.mozilla.org/show_bug.cgi?id=1111633

Project Dashboard

Meta Bugs

Full Query

ID	Summary	Priority	Status
889230	[meta] Implement Custom Elements (from Web Components)	P3	RESOLVED

1 Total; 0 Open (0%); 1 Resolved (100%); 0 Verified (0%);

Ship Bugs

Full Query

ID	Summary	Status	Target milestone	Resolution	Assigned to	Depends on	Blocks
1121994	Implement adopted callback for custom elements	RESOLVED	mozilla58	FIXED	John Dai[:jdai]		889230, 1293921
1231265	support custom-element lifecycle callbacks with content from external document	RESOLVED	---	INVALID	Edgar Chen [:edgar]		889230
1253086	Unresolved Pseudo Selector Broken	RESOLVED	---	INVALID	Edgar Chen [:edgar]		889230
1274159	Add [HTMLConstructor] to support custom element feature	RESOLVED	mozilla53	FIXED	Edgar Chen [:edgar]	1275835	889230, 1287348, 1301024, 1317658
1274505	Remove support of SVG-based custom element	RESOLVED	mozilla50	FIXED	John Dai[:jdai]		889230, 1276579, 1396765
1275832	Implement custom element name validation for custom element	RESOLVED	mozilla52	FIXED	John Dai[:jdai]		889230, 1275835, 1275839
1275833	Add CustomElementsRegistry interface for custom element	RESOLVED	mozilla50	FIXED	John Dai[:jdai]	1289872	889230, 1275835, 1275838, 1275839
1275835	Implement CustomElementsRegistry define function	RESOLVED	mozilla51	FIXED	Edgar Chen [:edgar]	1275832, 1275833	889230, 1274159, 1275838, 1275839
1275838	Implement CustomElementsRegistry get function	RESOLVED	mozilla52	FIXED	John Dai[:jdai]	1275833, 1275835	889230
1275839	Implement CustomElementsRegistry whenDefined function	RESOLVED	mozilla52	FIXED	John Dai[:jdai]	1275832, 1275833, 1275835	889230
1287348	Implement construction stack for upgrading an element	RESOLVED	---	DUPLICATE	Edgar Chen [:edgar]	1274159	889230
1288306	Disable custom elements web-platform v0 tests	RESOLVED	mozilla50	FIXED	Edgar Chen [:edgar]		889230, 1396765
1292125	Revert registerElement's web components permission check to support b2g consumers	RESOLVED	---	WONTFIX	John Dai[:jdai]		889230
1294100	TypeError: Argument 2 of Document.createElement can't be converted to a dictionary.	VERIFIED	mozilla51	FIXED	John Dai[:jdai]		889230, 1276579
1299363	Implement custom element v1 upgrade algorithm	RESOLVED	mozilla57	FIXED	John Dai[:jdai]	1325279, 1353647, 1359346	889230, 1301024, 1319342, 1331334, 1378079
1301024	Creating an custom element via createElement/createElementNS should call constructor or run upgrade steps	RESOLVED	mozilla58	FIXED	John Dai[:jdai]	1274159, 1299363, 1354013, 1407669, 1411088	889230, 1331334, 1396761
1309140	Rename CustomElementsRegistry to CustomElementRegistry	RESOLVED	mozilla52	FIXED	John Dai[:jdai]		889230
1309147	Add [CEReactions] to support custom element reactions	RESOLVED	mozilla55	FIXED	John Dai[:jdai]	1347446	889230, 1315885, 1340027
1309176	Add stack-of-queues system for custom element reaction	RESOLVED	---	DUPLICATE	John Dai[:jdai]		889230
1309184	Implement upgrade reaction for custom element reactions	RESOLVED	mozilla53	FIXED	John Dai[:jdai]		889230, 1319342, 1325279
1315885	Implement callback reaction for custom element reactions	RESOLVED	mozilla56	FIXED	John Dai[:jdai]	1309147, 1325279, 1347446	889230, 1293921, 1379573
1319342	Cloning a node runs concept-create-element steps with synchronous-custom-elements-flag unset which enqueues an upgrade reaction	RESOLVED	mozilla58	FIXED	John Dai[:jdai]	1299363, 1309184	889230
1325279	Put the reaction queue in CustomElementData structure instead of using a map	RESOLVED	mozilla55	FIXED	Edgar Chen [:edgar]	1309184, 1359346	889230, 1299363, 1315885
1340027	Add annotation with the [CEReactions] attribute	RESOLVED	mozilla56	FIXED	John Dai[:jdai]	1293921, 1309147	889230
1341693	Crash [@mozilla::dom::WindowBinding::get_customElements]	RESOLVED	mozilla54	FIXED	Edgar Chen [:edgar]		1340565, 889230
1347446	Move custom element reactions stack to DocGroup	RESOLVED	mozilla55	FIXED	John Dai[:jdai]	1350960	889230, 1309147, 1315885
1348220	Crash when custom element lifecycle callback is invoked (dom.webcomponents.customelements.enabled=true)	RESOLVED	---	INVALID	Edgar Chen [:edgar]		889230
1351979	Change CustomElementRegistry::Define code to properly propagate out JS exceptions	RESOLVED	mozilla55	FIXED	Edgar Chen [:edgar]		889230
1352290	Add assertions to CustomElementReactionsStack::Enqueue to ensure upgrade reactions aren't scheduled to BackupQueue	RESOLVED	mozilla58	FIXED	Edgar Chen [:edgar]		889230
1354013	Creating customized built-in elements without relevant definitions registered first shouldn't throw NotFoundError	RESOLVED	mozilla55	FIXED	Edgar Chen [:edgar]		889230, 1301024
1357002	Calling document.createElement() with a second arg that includes "is" should not have noticeable slowdown when custom elements feature is pref-ed off	RESOLVED	mozilla55	FIXED	Edgar Chen [:edgar]		889230
1359346	Implement custom element state	RESOLVED	mozilla55	FIXED	Edgar Chen [:edgar]		889230, 1299363, 1325279
1406297	Document.createElement must report an exception which is user defined thrown by a custom element constructor	RESOLVED	mozilla58	FIXED	John Dai[:jdai]		889230
1406325	Custom element clone node without definition should put into candidate map in order to upgrade later	RESOLVED	mozilla59	FIXED	John Dai[:jdai]		889230
1406825	Enable Custom elements v1 on Nightly by default	RESOLVED	mozilla59	FIXED	Edgar Chen [:edgar]	1433691, 1410536, 1413785, 1419305, 1428244, 1432308, 1439794, 1446144	889230
1407669	Custom element creation hides exceptions from the constructor	RESOLVED	mozilla59	FIXED	John Dai[:jdai]		1407576, 889230, 1301024, 1396761
1410536	Enabling the dom.webcomponents.customelements.enabled pref causes some talos regressions (dromaeo_dom, maybe tabpaint)	RESOLVED	---	FIXED	Edgar Chen [:edgar]	1392974	889230, 1396567, 1406825
1413785	Crash when browsing to nest website with custom elements pref enabled	RESOLVED	---	DUPLICATE	Edgar Chen [:edgar]		889230, 1406825
1414317	Add [CEReactions] to document.createElement and document.createElementNS	RESOLVED	mozilla58	FIXED	Edgar Chen [:edgar]		889230
1415761	Assertion failure while we are invoking custom element reactions in the middle of throwing an exception	RESOLVED	mozilla59	FIXED	Edgar Chen [:edgar]	1393806	1340565, 889230
1419305	https://nest.com/cameras/nest-cam-iq-outdoor/overview/ sometimes isn't displayed correctly with enabling custom elements pref	RESOLVED	mozilla59	FIXED	Edgar Chen [:edgar]		889230, 1406825
1419662	Autonomous custom element get confused if it contains 'is' attribute	RESOLVED	mozilla59	FIXED	John Dai[:jdai]		889230
1425079	Add WPT test for the attributeChangedCallback which is triggered from parser	RESOLVED	mozilla59	FIXED	Edgar Chen [:edgar]		889230, 1428784
1425400	https://santatracker.google.com/village.html seems not be displayed correctly with custom elements enabled	RESOLVED	---	DUPLICATE	Edgar Chen [:edgar]		889230
1428244	The attributeChangedCallback for style attribute is always fired with null as oldValue and empty string as newValue	RESOLVED	mozilla59	FIXED	Edgar Chen [:edgar]		889230, 1406825, 1419308, 1419322
1429967	PolymerElements/app-layout demo4 is missing body content when Custom Elements are enabled	RESOLVED	---	DUPLICATE	Edgar Chen [:edgar]	1430034	889230
1429993	When the Home Assistant sidebar is initially open and then collapsed, the header doesn't reposition itself	RESOLVED	---	DUPLICATE	Edgar Chen [:edgar]		889230
1430034	PolymerElements/iron-ajax demo page is missing contents when Custom Elements are enabled	RESOLVED	mozilla59	FIXED	Edgar Chen [:edgar]		889230, 1429967
1480618	Range APIs do not construct / move trees in tree order (observable by custom elements)	RESOLVED	mozilla63	FIXED	Edgar Chen [:edgar]		889230

49 Total; 0 Open (0%); 48 Resolved (97.96%); 1 Verified (2.04%);