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While drafting this month's issue I checked alpha() against the browsers rather than the compat data. BCD said Chrome 151. 151 does not parse it; 152 does. wpt.fyi and chromestatus agreed. I filed it, and MDN fixed it today.
https://github.com/mdn/browser-compat-data/issues/30731
2026-10-15T15:51:01.463Z