Here's a screencast to illustrate comment 3. In the screencast, I've got Chrome's devtools open, focused on one of the images with the CSS rule that I quoted in comment 3. As you can see, **only** the `-webkit-mask-box` declarations are accepted (and the bottom two, the ones that Firefox honors, are rejected by Chrome). If I turn off the ` -webkit-mask-box` declarations, and add `-webkit-` prefixes to the bottom two decoarations so that Chrome will accept them, then Chrome changes its rendering to match Firefox. (which lends credence to the correctness of Firefox's handling/interoperability for those last two declarations.)
Bug 1567987 Comment 6 Edit History
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Here's a screencast to illustrate comment 3. In the screencast, I've got Chrome's devtools open, focused on one of the images with the CSS rule that I quoted in comment 3. As you can see, **only** the `-webkit-mask-box` declarations are accepted (and the bottom two, the ones that Firefox honors, are rejected by Chrome). If I turn off the ` -webkit-mask-box` declarations, and add `-webkit-` prefixes to the bottom two decoarations so that Chrome will accept them, then Chrome changes its rendering to match Firefox, as shown at the end around 0:16 (which lends credence to the correctness of Firefox's handling/interoperability for those last two declarations.)