[css-transforms-2] transform-style initial value

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
css
Domain
frontend

Research direction

Start with the CSS Transforms Level 2 transform-style section linked in the issue and compare its stated values and initial value with the reported browser behavior. Check whether the claims about stacking and 3D rendering contexts are supported by the specification text. Done means resolving the reported spec/implementation discrepancy.

Written by the indexing model from the issue text.

Description

css-transforms-2

There is a discrepancy between spec and implementations.

https://drafts.csswg.org/css-transforms-2/#transform-style-property

Value: auto | flat | preserve-3d
Initial: auto

A value of "flat" for transform-style establishes a stacking context, and establishes a 3D rendering context.

Chrome, Edge, Firefox and Safari support flat and preserve-3d, but not auto; they have initial value flat. I suspect they do not establish a stacking context and 3D rendering context whenever transform-style is flat.

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Merged PRs (30d)
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