WaterWhisperer a90dff6919 script/layout: Implement Element.currentCSSZoom attribute (#40304) ...

Implements the `currentCSSZoom` readonly attribute on the Element
interface as
[spec](https://drafts.csswg.org/cssom-view/#dom-element-currentcsszoom).
- Adds a new layout query (`CurrentCSSZoomQuery`) that traverses from
the target element up through its ancestors
- Accumulates the product of all `zoom` CSS property values to compute
the effective zoom
- Returns 1.0 for elements that are not being rendered (display: none or
no layout data)

Testing: Updated WPT (removed 4 FAIL expectations from
`idlharness.html.ini`). Behavior tests in Element-currentCSSZoom.html
remain as expected FAIL because the underlying CSS `zoom` property
implementation in Servo does not yet apply zoom values to layout (the
zoom property is parsed but computed values remain 1.0).
Fixes: #40256

Signed-off-by: WaterWhisperer <waterwhisperer24@qq.com>

2025-11-05 14:25:53 +00:00

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