Re: [w3c/clipboard-apis] Link to the HTML spec's "has focus steps". (#143)

The other steps handle iframe nesting cases. If you call `document.hasFocus()` inside an iframe, then this is true if:

- The iframe itself has focus within its parent (times N if it's multiply nested)
- The top-level BC has system focus

In non-iframe cases, target's BC = target's BC's TLBC, so candidate = target so the loop quits immediately.

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