1896734 - (calc-size) Implement css calc-size() function

Status: NEW

(Core :: CSS Parsing and Computation, enhancement)

Description

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

This is a bug to implement the calc-size() function. (This would live partly in the style system and partly in layout.) See:

• Specification: https://drafts.csswg.org/css-values-5/#calc-size
• Explainer: https://github.com/w3c/csswg-drafts/blob/main/css-values-5/calc-size-explainer.md
• Mozilla standards-position: https://github.com/mozilla/standards-positions/issues/1022
• Chromestatus: https://chromestatus.com/feature/5196713071738880
• WPT: https://wpt.fyi/results/css/css-values/calc-size