[Webkit-unassigned] [Bug 195628] CSS Variable expression re-evaluated on dom change causing image reload

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195628

--- Comment #13 from Antti Koivisto <koivisto at iki.fi> ---
CSS variables are evaluated at style resolution time. Side effects like resource loads are retriggered. The behavior difference with other engines seen here is a result of different caching behavior (WebKit respects the uncacheable redirect of the referenced resource). I confirmed this with a Firefox engineer too.

You see a variant of caching-dependent behavior on Chrome too if you open the codepen into two separate windows and hover between them.

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