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Issue: Specify what happens with 'mix-blend-mode'.
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</div>
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### [=Compute the interest rectangle=] ### {#compute-the-interest-rectangle-algorithm}
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<div algorithm>
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To <dfn lt="computing the interest rectangle|compute the interest rectangle">compute the interest rectangle</dfn> of an {{Element}} |element|, perform the following steps.
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They return a rectangle.
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Note: The interest rectangle is the subset of |element|'s [=border box=] that should be captured.
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This is required for cases where an element's border box needs to be clipped because of hardware constraints.
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For example, if it exceeds the maximum texture size.
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1. Assert: |element| is not |element|'s [=node document=]'s [=document element=].
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Note: The [=document element=] is captured differently, as specified in [=capture the image=].
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1. If |element|'s [=border area=] does not exceed an implementation-defined maximum size,
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then return a rectangle that is equal to |element|'s [=border box=].
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1. Otherwise:
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Issue: Define the algorithm used to clip the snapshot when it exceeds max size.
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