Re: [w3c/clipboard-apis] Support for putting images on the clipboard (#44)

The reason that I don't trust sanitizing images is that we render out up to 32k x 32k PNG and JPG.  We also pass-through APNG files, and would like to pass through GIF.  I can see the sanitizer trying to open these large files to re-render them and failing, or the alternative is doing all the work on the CPU and taking forever for large images.  These files are all small enough once compressed but can still be a few hundred MB, and it feels like all attack vectors are in the header or IDAT lengths in the case of PNG.

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