Surprised to find that Edge/FF return an empty string for GCS CSS shorthands. Webkit browsers return the computed value. cc: @zcorpan
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I believe that was required by some/all versions of DOM Level 2 Style
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but we haven't followed it for properties that were converted to shorthands
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guess I misremembered, then

Aug 25, 2016 · 1:47 AM UTC

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bugzil.la/137688 which reminds me that getPropertyValue supposed to return null for shorthands
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