Re: [w3ctag/design-reviews] Feature detection for supported clipboard formats (Issue #901)

Hi there, 

We looked at this today in a breakout during our London F2F. We overall think the feature is a good addition to the web platform and a low hanging fruit for improving DX.
  
One concern that came up is that `supports()` is a rather generic name, but the type of support being tested is very specific. This could hinder both learnability and future extensibility. One way to address that would be to adopt a dictionary argument (e.g. `ClipboardItem.supports({type: "image/webp"})`). If it later becomes clear that MIME type is the primary criteria that support queries are used for, a string argument could be supported as an overloaded shortcut.
  
Btw we had a lot of trouble reviewing this feature because the explainer was a GitHub issue, and the only way to see what was actually proposed was to read the spec. It wou;d be helpful for both us and others to have [an explainer](https://tag.w3.org/explainers/), even if brief.

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