HTML API Debugger

Add a page to wp-admin for debugging the HTML API.

0.1

• Initial release.

0.2

• Remove redundant module.
• Rearrange debugging panes.
• Add option to show invisible characters.

0.3

• Add button to copy instant playground link.

0.4

• Improve debugger visibility controls.
• Add handling for real/virtual nodes.

0.5

• Use regular REST API result response shape.
• Display text content of “atomic” HTML API nodes like textarea or xmp.

0.6

• Add better unsupported error messages when possible. (WordPress >= 6.7)

0.7

• Fix some issues where parsing errors could crash the client.

0.8

• Show invisible characters in processed HTML spans.
• Fix null-byte rendering in the initial page render.

0.9

• Fix a bug where “}” was replaced as an invisible character.
• Add a quirks mode toggle that allows changing the doctype used.

1.0

• Prevent flash of “�” replacing null-byte in input on initial render.
• Support HTML API quirks mode.
• Support for full HTML processor.
• Configurable hover information on nodes: depth and breadcrumbs or insertion mode.

1.1

• Print tag namespaces.

1.2

• Handle CDATA sections.
• Use WordPress Script Modules API for all modules.

1.3

• Replace wp-api-fetch script dependency with native fetch.
• Improve error messages.
• Display templates consistently between DOM and HTML API trees.
• Use “qualified” names. SVG and MathML tags and attributes have some specialized casing.

1.4

• Show invisible characters in the tree in attribute names, values, and tag names.
• Handle DOCTYPE nodes.
• Prevent newlines from automatically being added to the HTML input.
• Use async event directives if available.
• Handle doctype tokens and display information about quirks-mode.

1.5

• Improve initial rendering and reduce layout shift.
• Allow copying playground links to latest, beta, and nightly versions.
• Allow copying playground links to specific wordpress-develop PRs.

1.6

• Replace TABLE based layout with CSS grid.
• Fix a crash on meta tags with a content attribute.
• Display namespace on tag closers.
• Display normalized HTML when supported.