HTML API: Plans for 6.7

[dmsnell]

🔝Block API | HTML issues | Refactors | ↑ Broader Roadmap | ← Plans for 6.6 | → Plans for 6.8

Publications

• Updates to the HTML API in 6.7
• Progress Report: HTML API

Pre-release checklist.

• Review all docblocks and ensure they have appropriate example code.
• Review HTML API class docblocks and ensure they are updated to match currently support.
• Gather all non-trunk bug-fixes and enhancements into the Updates to the HTML API post.

Lingering work from 6.6

• Review all of the push/pop mechanics and polish them, figure out the proper comprehensive model of operation, and refactor the internals to ensure they are elegant and can be introspected.

Added Spec Support (Core-61576)

• Tag supports:

  • SVG and MathML foreign content.
    • HTML API: Handle parsing changes in foreign content. wordpress-develop#6006
    • Have get_qualified_tag_name() return lowercase tag names.
  • TABLE support.
    • HTML API: Add table support wordpress-develop#6040
  • SELECT support.
    • HTML API: Add select handling wordpress-develop#5908
  • FORM support.
  • TEMPLATE support.
    • HTML API: Implement TEMPLATE and related support wordpress-develop#7046
  • PLAINTEXT support.
    • HTML API: Add PLAINTEXT tag handling wordpress-develop#5905

• Various supports:

  • HTML API: Stub out remaining insertion modes. wordpress-develop#6973
  • HTML API: Improve implementation of adoption agency algorithm wordpress-develop#6983
  • HTML API: Implement active format reconstruction wordpress-develop#6982
  • HTML API: Implement reset_insertion_mode wordpress-develop#6020
  • HTML API: Complete missing tags in the IN BODY insertion mode. wordpress-develop#6972
  • HTML API: Add create_full_parser() for non-fragment parsing. wordpress-develop#6977
  • HTML API: Simplify breadcrumb accounting. wordpress-develop#6981
  • HTML API: Implement step_in_caption wordpress-develop#7041
  • HTML API: Add in_column_group parsing wordpress-develop#7042
  • HTML API: Implement step_in_select_in_table wordpress-develop#7044
  • HTML API: Close all elements at the end of a document. wordpress-develop#7085
  • HTML API: Allow any fragment context. wordpress-develop#7141
  • HTML API: Add support for missing FRAMESET and "after" insertion modes. wordpress-develop#7165

• Parse DOCTYPE public and system identifiers, used for detecting quirks mode.

• Testing and verification (Core-61646, Core-61530)

  • HTML API: Join successive text nodes in html5lib test representation. wordpress-develop#6984
  • HTML API: Expand Unsupported class and make it available for debugging. wordpress-develop#6985
  • HTML API: Fix unsupported insertion mode messages wordpress-develop#7043
  • HTML API: Add tests for comments wordpress-develop#6765
  • HTML API: Test improvements wordpress-develop#7030
  • HTML API: Use full parser for html5lib tests wordpress-develop#7117

New Features and Interfaces

• Core-61617 Add set_modifiable_text() for plaintext-only modifications.
  • HTML API: Add set_modifiable_text() for replacing text nodes. wordpress-develop#7007
  • HTML API: Ensure that get_modifiable_text() reads enqueued updates. wordpress-develop#7150

Bug Fixes

• Core-61560 The Fragment parser should not add the context node to the stack of open elements.

• Core-61851 HTML_Processor::next_tag() should respect the tag_name argument.

  • HTML API: Respect tag_name query arg in HTML_Processor::next_tag() wordpress-develop#6980

• Various fixes:

  • HTML API: Correct node name in generate_implied_end_tags(). wordpress-develop#6988
  • Core-61719 If kses rejects an attribute update, set_attribute() should return false.
    • Skip escaping for data URI in WP_HTML_Tag_Processor wordpress-develop#7114
  • Core-61810 Infinite loop on inputs with a missing SCRIPT end tag, which end in - or <.
    • HTML API: Fix possible infinite loop parsing incomplete script tags wordpress-develop#7128

• Audit of CSS semantics and behaviors (Core-61531)

  • HTML API: Remove leading whitespace removing class names wordpress-develop#6933
  • HTML API: Parse doctypes and set full parser quirks mode correctly wordpress-develop#7195
  • HTML API: Replace null-bytes in class_list class names wordpress-develop#7187
  • HTML API: CSS class name methods should behave according to quirks mode wordpress-develop#7169

Enhancements

• Core-61545 General performance improvements.

  • HTML API: Optimize low-level parsing details. wordpress-develop#6890

• Core-61399 Add type annotations to HTML API code.

  • HTML API: Add PHP type annotations wordpress-develop#6753
  • HTML API: Fix phpdoc nullable types wordpress-develop#7031

• Add is_self_contained_element() to identify special atomic elements like SCRIPT, STYLE, TITLE, etc…

  • HTML API: Add new is_self_contained() method to Tag Processor. wordpress-develop#7198

Blocks

• Continue developing block attribute sourcing.
• Iterate on the Server Directive Processor.
• Iterate on the Block Bindings processor.

Not likely in 6.7

• Setting inner or outer HTML because it should parse the provided new HTML in a fragment parser whose context node is the one in which it is found. Also, because we have to solve the problem of composition and avoiding re-parsing every level of inner content.
  • With outside help a form of this may make it in to 6.7.

Backports into Gutenberg

• Compat: Update HTML API with changes from 6.6 #63089