[Webkit-unassigned] [Bug 245033] New: [css-values-4] Implement font-relative cap/rcap CSS units

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=245033

            Bug ID: 245033
           Summary: [css-values-4] Implement font-relative cap/rcap CSS
                    units
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kizmarh at ya.ru

Link to the spec for the `cap` unit: https://www.w3.org/TR/css-values-4/#cap (was proposed in 2016, added to specs in 2017 — https://github.com/w3c/csswg-drafts/issues/660)

Firefox already supports it (end of 2021, https://bugzilla.mozilla.org/show_bug.cgi?id=1702924), and it would be really nice if Webkit would start supporting it as well.

Having more font-relative units would be really nice — for some calculations they might be crucial.

Example demo which uses `cap` unit — https://codepen.io/kizu/pen/dyeXPJP?editors=1100

Above is the version without a fallback, here is a link to a version with a fallback, using a CSS variable of 1.4ex when `cap` is not supported: https://codepen.io/kizu/pen/wvjWvZG?editors=1100 — it can be used as an approximation of how it should look, or alternatively you can check out the first link in Firefox.

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