Bug 269878 – baseline-shift initial value should be `0px` rather than `baseline`

• Status: NEW
• Component: CSS

[Ahmad Saleem]

Hi Team,

As title says, this bug is to fix baseline-shift initial value as per CSS spec.

NOTE - It was in SVG spec but now getting removed in SVG2 but it is in CSS Inline spec, which should be followed.

Old SVG1.1 - https://www.w3.org/TR/SVG11/text.html#BaselineShiftProperty

SVG2 (SVGWG) - https://svgwg.org/svg2-draft/text.html#BaselineShiftProperty

"SVG 2 will deprecate ‘baseline-shift’ and use ‘vertical-align’ instead."

CSS Spec - https://drafts.csswg.org/css-inline-3/#baseline-shift-property

WPT Test - https://wpt.fyi/results/css/css-inline/inheritance.html?label=master&label=experimental&aligned

> Property baseline-shift has initial value 0px	

__

It is easy to fix by modifying:

> Source/WebCore/rendering/style/SVGRenderStyle.h

From: static BaselineShift initialBaselineShift() { return BaselineShift::Baseline; }

To: static BaselineShift initialBaselineShift() { return BaselineShift::Length; }

and

From: static SVGLengthValue initialBaselineShiftValue() { return SVGLengthValue(0, SVGLengthType::Number); }

To: static SVGLengthValue initialBaselineShiftValue() { return SVGLengthValue(0, SVGLengthType::Pixels); }

__

Any input is welcome.

Thanks!

[Ahmad Saleem]

Web-Spec: https://drafts.csswg.org/css-inline-3/#property-index

[Ahmad Saleem]

Draft PR - https://github.com/WebKit/WebKit/pull/24908

[Radar WebKit Bug Importer]

<rdar://problem/123792212>