intrinsicsize-attribute
                                
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                        Should we allow "intrinsicsize" to be updated/removed?
Updating/removing "intrinsicsize" may potentially cause an image to resize.
I think the answer should be yes, since other attributes like "width" "height" can all be added/removed/updated and changing those attributes also cause an image to resize.
People may argue this way may allow developers to work around "unsized-media" policy. But we will be changing the behaviour of "unsized-media": when disabled, set default intrinsicsize to be "300 x 150", this way, even removing intrinsicsize attribute will not reset the image to its content size.
WDYT?
Strongly in favor of allowing it to be updated/removed, just as you can update/remove width, height, sizes, src &etc.