1388840 - adjust intrinsic size quirk for form controls, per CSS WG resolution

Status: NEW

(Core :: Layout, enhancement, P3)

Description

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

In https://github.com/w3c/csswg-drafts/issues/765 the CSS WG resolved to accept a proposed quirk for form control intrinsic sizing, with some changes from the way we implemented it in bug 823483.

I think there are two basic changes:
 (1) calc() expressions where part is a percent should have the percent-part resolve to 0, but not the whole thing resolve to 0

 (2) The quirk should apply for the same cases for width and max-width, rather than applying to truly-replaced elements for both properties and certain form controls for width only.  In other words, the quirk should be extended to the form controls and percentage max-width.

Comment 1

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

I have patches to do this.

Comment 2

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

For what it's worth, the patches I had were:
https://hg.mozilla.org/users/dbaron_mozilla.com/patches/raw-file/d516a8e7b42953f76226c76860d018ce81b2796a/calc-width-max-width-changes
https://hg.mozilla.org/users/dbaron_mozilla.com/patches/raw-file/d516a8e7b42953f76226c76860d018ce81b2796a/css-sizing-form-control-quirk-calc-changes
https://hg.mozilla.org/users/dbaron_mozilla.com/patches/raw-file/d516a8e7b42953f76226c76860d018ce81b2796a/css-sizing-form-control-quirk-scope-changes