What type of issue is this?

Missing compatibility data

What information was incorrect, unhelpful, or incomplete?

Safari 15.4 released not enough information about the supported CSS math functions:

WebKit added support for calc() math functions including sin, cos, tan, e, pi, exp, log, atan, acos, asin, and atan2.

But actually, they added support for many more functions. They just didn't list them all in the release notes.

I found tickets in "WebKit Bugzilla" which add support to many CSS functions, and made sure they shipped by checking browser support on "Web Platform Tests" (tests fail on Safari 15.3, and pass on Safari 15.4).

We need to document all the supported CSS functions. Those that mentioned in the release note, and those that didn't.

What browsers does this problem apply to, if applicable?

Safari

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

Release notes:

• https://webkit.org/blog/12445/new-webkit-features-in-safari-15-4/

WebKit Bugzilla:

• https://bugs.webkit.org/show_bug.cgi?id=203312 - Implement the CSS exponent functions: pow(), sqrt(), hypot()
• https://bugs.webkit.org/show_bug.cgi?id=229897 - Implement exp,log functions calc functions
• https://bugs.webkit.org/show_bug.cgi?id=229786 - Implement abs,sign calc functions
• https://bugs.webkit.org/show_bug.cgi?id=230073 - Implement round,mod,rem functions for calc

Web Platform Tests:

• https://wpt.fyi/results/css/css-values?label=master&label=stable&product=chrome&product=edge&product=firefox&product=safari-15.4%20%2816613.1.17.1.11%29&aligned&view=subtest&q=round-mod-rem
• https://wpt.fyi/results/css/css-values?label=master&label=stable&product=chrome&product=edge&product=firefox&product=safari-15.4%20%2816613.1.17.1.11%29&aligned&view=subtest&q=cos
• https://wpt.fyi/results/css/css-values?label=master&label=stable&product=chrome&product=edge&product=firefox&product=safari-15.4%20%2816613.1.17.1.11%29&aligned&view=subtest&q=hypot-pow-sqrt
• https://wpt.fyi/results/css/css-values?label=master&label=stable&product=chrome&product=edge&product=firefox&product=safari-15.4%20%2816613.1.17.1.11%29&aligned&view=subtest&q=exp-log
• https://wpt.fyi/results/css/css-values?label=master&label=stable&product=chrome&product=edge&product=firefox&product=safari-15.4%20%2816613.1.17.1.11%29&aligned&view=subtest&q=signs-abs

MDN URL

• https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Functions#math_functions

BCD Progress

Stepped value functions:

• round() - feat(css): Add CSS Values Level 4 round() compatibility data #17874
• mod() - feat(css): Add CSS Values Level 4 mod() compatibility data #17873
• rem() - feat(css): Add CSS Values Level 4 rem() compatibility data #17872

Trigonometric functions:

• sin() - feat(css): Add CSS Values Level 4 sin() compatibility data #17170
• cos() - feat(css): Add CSS Values Level 4 cos() compatibility data #17205
• tan() - feat(css): Add CSS Values Level 4 tan() compatibility data #17206
• asin() - feat(css): Add CSS Values Level 4 asin() compatibility data #17207
• acos() - feat(css): Add CSS Values Level 4 acos() compatibility data #17218
• atan() - feat(css): Add CSS Values Level 4 atan() compatibility data #17220
• atan2() - feat(css): Add CSS Values Level 4 atan2() compatibility data #17221

Exponential functions:

• pow() - feat(css): Add CSS Values Level 4 pow() compatibility data #17869
• sqrt() - feat(css): Add CSS Values Level 4 sqrt() compatibility data #17870
• hypot() - feat(css): Add CSS Values Level 4 hypot() compatibility data #17871
• log() - feat(css): Add CSS Values Level 4 log() compatibility data #17255
• exp() - feat(css): Add CSS Values Level 4 exp() compatibility data #17256

Sign-related functions:

• abs() - feat(css): Add CSS Values Level 4 abs() compatibility data #10552
• sign() - feat(css): Add CSS Values Level 4 sign() compatibility data #10570