[nicoburns]

Summary

Node::hit_inner recursed into children whenever the point was inside the node's scrollable overflow or content rect, even when the node clips. So content overflowing an overflow: hidden ancestor stayed clickable in the region that was clipped away. Example: DuckDuckGo's .frm__select { overflow: hidden; width: 145px } wraps select { width: 140% }, so clicks to the right of the visible box still opened the select (found while testing #1321).

Descendant hits are now clipped per axis at the padding edge, plus overflow-clip-margin, whenever a node clips on that axis. Scroll offsets and transforms are handled. Hoisted (positioned) descendants walk their containing-block chain, so an abspos child whose containing block is outside the clipping element still escapes the clip, matching paint. The containment predicate is extracted from blitz-paint/src/render.rs and shared; paint behaviour is unchanged.

Local WPT: css/css-overflow/overflow-clip-margin-hit-testing.html goes FAIL → PASS. The rest of css/css-overflow and the elementFromPoint*/elementsFromPoint* tests are unchanged.

Not changed:

• clip-path hit-testing.
• Paint still clips both axes when either axis clips, and ignores overflow-clip-margin.

Link to Devin session: https://dioxus.staging.devinenterprise.com/sessions/55516ded5eb14b35b0c9bca6b400ca61
Open in Devin Desktop: https://dioxus.staging.devinenterprise.com/desktop/session/55516ded5eb14b35b0c9bca6b400ca61?variant=devin-insiders

WPT results

Subtests: 6 newly passing, 0 newly failing (net +6).

Subtest changes by area (7 areas)

+ css              | +6 (+6 / -0) | 59.64% -> 59.64% (+0.00%) | 118840 -> 118846 / 199259
+   CSS2           | +1 (+1 / -0) | 78.83% -> 78.84% (+0.01%) |   6954 ->   6955 /   8822
+     floats       | +1 (+1 / -0) | 74.89% -> 75.33% (+0.44%) |    170 ->    171 /    227
+   css-borders    | +2 (+2 / -0) | 62.96% -> 63.07% (+0.11%) |   1115 ->   1117 /   1771
+     border-shape | +2 (+2 / -0) | 12.34% -> 13.64% (+1.30%) |     19 ->     21 /    154
+   css-break      | +2 (+2 / -0) | 16.23% -> 16.33% (+0.10%) |    320 ->    322 /   1972
+   css-overflow   | +1 (+1 / -0) | 38.16% -> 38.22% (+0.06%) |    677 ->    678 /   1774

Full diff (5 changed tests)

+ FAIL => PASS  [1/1]  +1  css/CSS2/floats/hit-test-floats-005.html
+ FAIL => PASS  [3/3]  +1  css/css-borders/border-shape/border-shape-overflow-clip-margin-hit-test-ref-boxes.html
+ FAIL => PASS  [1/1]  +1  css/css-borders/border-shape/border-shape-overflow-clip-margin-hit-test.html
+ FAIL => PASS  [4/4]  +2  css/css-break/hit-test-hidden-overflow.html
+ FAIL => PASS  [1/1]  +1  css/css-overflow/overflow-clip-margin-hit-testing.html

_{Generated by the WPT workflow.}

[staging-devin-ai-integration]

I'll fix CI failures and address comments from users with write access that start with 'Devin'.

• Disable automatic comment, CI, and merge conflict monitoring