Created attachment 8875579 [details] Test case In dom/smil/test/test_smilCSSFromTo.xhtml we have the following failure: stroke-dasharray: checking value halfway through animation - got "none", expected "20" I've reduced this in the attached test case to something like the following: <rect x="20" y="20" width="200" height="200" fill="purple" stroke="black" stroke-width="5"> <animate attributeName="stroke-dasharray" from="inherit" to="20" dur="4s" fill="freeze" /> <set attributeName="fill" to="green" begin="2s" /> </rect> In Gecko, the dash array changes after 2s (50% of the way through), i.e. at the same time the fill changes. In Stylo, however, the dash array changes after 4s. Debugging Stylo I see the following example output: Parsed stroke-dasharray property value '20' => 20 Parsed stroke-dasharray property value 'inherit' => none (i.e. parsing is correct) Interpolating StrokeDasharray(T()) with StrokeDasharray(T()) at 96.45% gives StrokeDasharray(T()) That is, when we go to interpolate an empty dash array list with a non-empty one, we just end up returning the empty one, even after the 50% mark. Until we introduce infallible interpolation, we should just fail in this case so SMIL can trigger the 50% switch behavior.
I want to make this P2 since it blocks an important test test_smilCSSFromTo.xhtml but it's probably not critical.
I working on similar phenomenon which stylo can't interpolate between percentage and length.(bug 1369614) But the current stylo looks like support this types. (i.e. Current stylo can interpolate stroke-dasharray between "none" and "20"). I think that stylo interpolate this type as RepetableListAnimatable. (i.e. If either one of from/to values is None, stylo will animate stroke-dasharray as discrete type.) Brian, Could you please confirm that you can reproduce this bug on current stylo?
Yes, it works for me now. Perhaps fixed by bug 1338764?
Status: NEW → RESOLVED
Last Resolved: 2 years ago
Resolution: --- → INVALID
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