Workers, ports across them, frames that measure themselves, scripts that run once
Fixed boxes: placed in turn, kept under their stacking context, clipped by the viewport alone
Pictures: height:auto over the attribute, aspect-ratio, object-fit; one pointer move a turn; the reftest score
The bookmarks manager, its import and backups; form controls: padding, placeholders, baselines, select-all; new script verbs
An object's and an embed's documents, pictures and fallback; 16886 / 26275 scripted, 9410 / 14616 reference
Named access on the window; text parted by an out-of-flow flex or grid child; the iframe load event in the load sequence; WPT 9380 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011ebXZs43Ks9pd5MerR62rG
Frames: an iframe draws its document under the framing rules; the root's top margin; WPT 9286 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011ebXZs43Ks9pd5MerR62rG
Inline box edges placed by the box's own direction; WPT 9261 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011ebXZs43Ks9pd5MerR62rG
Soft hyphens, hyphens and hyphenate-character; auto-phrase holds hyphenation back; WPT 9249 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011ebXZs43Ks9pd5MerR62rG
HTML's bidi rules for dir, bdo and bdi; WPT 9233 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011ebXZs43Ks9pd5MerR62rG
Bidi: the formatting characters written in the text, overrides on blocks, isolate-override and plaintext as their controls; WPT 9228 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011ebXZs43Ks9pd5MerR62rG
Line breaking: where a line may end, the wrapping properties, the conformance file Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011ebXZs43Ks9pd5MerR62rG
SVG: the subset, its limits, the replaced-box rules, the score
Group transparency, and the measured figure with it
Boxes that scroll, and inline boxes that take their words into a layer
The engine as it stands after sticky, :has, shared baselines and the vertical picture rule
Writing modes, flex auto margins, and the score with a longer yardstick
Both axes of a flex container, a grid's columns, a table's columns and an indent read the way their direction says
bidirectional text, reordered and drawn
dir=auto and unicode-bidi: plaintext
direction and the dir attribute
The content-based sizing keywords
text-align-last, justify-all and text-justify
text-align: justify, and the WPT number it moved
Lists number themselves with the list-item counter
A list marker can sit inside its item
Relative positioning reaches the boxes on a line
Layout: box-sizing, and the WPT number at 7238
Inline boxes take their room and draw their edges; the dashboard keeps Arizona time
Grid: absolutely positioned children in the areas their lines name