TPE DOM/Custom elements

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Introduction

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

References:


Taipei Main Members

Engineers: Edgar Chen (main contact), John Dai

Meeting Minutes

Sync-up minutes

Roadmap

Summary

We are now at Stage 4, working on performance work, especially on the critical blocker from enabling this feature on Nightly.

Details

[Stage 1] (completed)

  1. Remove support of SVG-based custom element.
  2. Window interface
  3. HTMLElement constructor
    • Support using ES6 classes
    • Construction stack
    • Bug: 1274159
  4. Document interface
    • createElement, createElementNS
    • Bug: 1276579
  5. window.customElements.define

[Stage 2] (completed)

  1. custom element upgrade reactions stack/queue
    • Upgrade reaction
  2. Algorithm of creating an element

[Stage 3] (completed)

  1. Callback reaction queue
  2. Lifecycle callbacks
      • sProcessingStack
      • EnqueueLifecycleCallback
    • connectedCallback
    • disconnectedCallback
    • attributeChangedCallback

[Stage 4] (WE'RE HERE)

  1. Performance work
  2. Enable on Nightly (estimated target 59)

[Stage 5]

  1. Ride to train

[Stage 6 - Backlog]

  1. Mutation algorithms (Shadow dom)
  2. CSS :define
  3. Performance
  4. Web-platform-tests

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%);


1st Impl. Shipping Blocker: Performance issues (INPROGRESS)

Full Query
ID Summary Status Target milestone Resolution Assigned to Depends on Blocks
1356761 Find a better capacity for custom element reactions stack and queues RESOLVED mozilla62 FIXED Olli Pettay [:smaug] 1396567
1392970 Consider having a reference of the CustomElementDefinition in the custom element itself RESOLVED mozilla58 FIXED Jessica Jong [:jessica] (inactive) 889230, 1396567, 1408828, 1410790
1392974 [CEReactions] operations should not cause noticeable slowdown if the documents don't have any custom element when custom element feature is enabled RESOLVED --- FIXED Edgar Chen [:edgar] 1421544, 1422197 1396567, 1410536
1396573 When custom elements preference is on, creating a non-custom element via document.createElement() shouldn't have a noticeable slowdown RESOLVED --- FIXED Edgar Chen [:edgar] 1419643 1396567
1396575 Track performance for creating an autonomous custom elements which doesn't match CE definition RESOLVED --- FIXED 1430951 1396567
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
1414178 Find a better way instead of iterate the candidates array and remove the element from the array RESOLVED --- DUPLICATE 1396567
1419643 Do not need to look up custom elements definition for a non-custom element RESOLVED mozilla59 FIXED Edgar Chen [:edgar] 1396567, 1396573
1419660 Track performance for creating a built-in custom elements doesn't match CE definition RESOLVED --- DUPLICATE 1396567
1419661 When custom elements preference is on, createElement with define() call and it'll run upgrade which is much slower than what we have now RESOLVED mozilla63 FIXED Olli Pettay [:smaug] 1420178, 1428784, 1440382, 1469446, 1470191 1396567
1420377 Avoid atomize 'is' value twice when the custom element is created from parser RESOLVED mozilla59 FIXED Edgar Chen [:edgar] 1396567
1430951 Avoid element name atomizing to improve performance of LookupCustomElementDefinition RESOLVED mozilla60 FIXED Edgar Chen [:edgar] 1396567, 1396575

12 Total; 0 Open (0%); 12 Resolved (100%); 0 Verified (0%);


Post 1st Ship: Stage_4 Bugs & Progress (BACKLOG)

Full Query
ID Summary Status Target milestone Resolution Assigned to Depends on Blocks
1326028 customElements.define must upgrade custom element in shadow-including tree order RESOLVED mozilla61 FIXED Blake Kaplan (:mrbkap) (inactive) 889230, 1419323
1331334 Implement :defined pseudo-class for custom elements RESOLVED mozilla63 FIXED Olli Pettay [:smaug] 1299363, 1301024, 1417829 889230, 1471871
1331341 Enqueue custom element upgrade/callbacks reactions in shadow-including tree order when inserting/removing a node RESOLVED --- DUPLICATE 889230

3 Total; 0 Open (0%); 3 Resolved (100%); 0 Verified (0%);


What Have Been DONE

1st Impl. Shipping Blocker: Stage_1 Bugs & Progress (DONE)

Full Query
ID Summary Status Target milestone Resolution Assigned to Depends on Blocks
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
1276579 Revise document.createElement[NS] for custom elements RESOLVED mozilla50 FIXED Jocelyn Liu [:jocelyn] [:joliu] 1274505, 1294100, 1318630, 1338889 889230, 1276240
1288306 Disable custom elements web-platform v0 tests RESOLVED mozilla50 FIXED Edgar Chen [:edgar] 889230, 1396765
1294100 TypeError: Argument 2 of Document.createElement can't be converted to a dictionary. VERIFIED mozilla51 FIXED John Dai[:jdai] 889230, 1276579
1309140 Rename CustomElementsRegistry to CustomElementRegistry RESOLVED mozilla52 FIXED John Dai[:jdai] 889230
1341693 Crash [@mozilla::dom::WindowBinding::get_customElements] RESOLVED mozilla54 FIXED Edgar Chen [:edgar] 1340565, 889230

12 Total; 0 Open (0%); 11 Resolved (91.67%); 1 Verified (8.33%);


1st Impl. Shipping Blocker: Stage_2 Bugs & Progress (IN PROGRESS)

Full Query
ID Summary Status Target milestone Resolution Assigned to Depends on Blocks
1287348 Implement construction stack for upgrading an element RESOLVED --- DUPLICATE Edgar Chen [:edgar] 1274159 889230
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
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
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
1347446 Move custom element reactions stack to DocGroup RESOLVED mozilla55 FIXED John Dai[:jdai] 1350960 889230, 1309147, 1315885
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
1378079 Creating an custom element from parser will synchronously call constructor RESOLVED mozilla58 FIXED Jessica Jong [:jessica] (inactive) 1299363, 1411088, 1510114 889230, 1418002
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

15 Total; 0 Open (0%); 15 Resolved (100%); 0 Verified (0%);


1st Impl. Shipping Blocker: Stage_3 Bugs & Progress (DONE)

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
1315885 Implement callback reaction for custom element reactions RESOLVED mozilla56 FIXED John Dai[:jdai] 1309147, 1325279, 1347446 889230, 1293921, 1379573
1334043 Implement connected lifecycle callbacks for custom elements RESOLVED mozilla58 FIXED Jessica Jong [:jessica] (inactive) 889230, 1293921, 1387125
1334044 Implement disconnected lifecycle callbacks for custom elements RESOLVED mozilla58 FIXED Jessica Jong [:jessica] (inactive) 889230, 1293921
1334051 Implement list of observed attributes for custom elements' attributeChanged callbacks RESOLVED mozilla57 FIXED Jessica Jong [:jessica] (inactive) 889230, 1293921
1340027 Add annotation with the [CEReactions] attribute RESOLVED mozilla56 FIXED John Dai[:jdai] 1293921, 1309147 889230
1392970 Consider having a reference of the CustomElementDefinition in the custom element itself RESOLVED mozilla58 FIXED Jessica Jong [:jessica] (inactive) 889230, 1396567, 1408828, 1410790

7 Total; 0 Open (0%); 7 Resolved (100%); 0 Verified (0%);