Re: [fxtf-drafts] [filter-effects][css-masking][fill-stroke] clarify userSpaceOnUse / objectBoundingBox applied to non-SVG elements (#249)

> * For `objectBoundingBox` (blue and green), Firefox & Chrome are consistent with each other, using the `border-box` as the bounding box, and creating a filter region that is 1.5 times the border-box width and half its height, and adjusting the box for transforms.

There is actually a Firefox bug here which means that this is not entirely true: If the element has overflow, e.g. due to box-shadow, then Firefox enlarges the `objectBoundingBox` to include that overflow. This is tracked in [bug 1067355](https://bugzilla.mozilla.org/show_bug.cgi?id=1067355).

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Received on Thursday, 6 June 2019 18:51:29 UTC