Allow explicitly indicating an `unchecked` state for an `<input type="checkbox">`. about html HOT 3 CLOSED

It's unchecked by definition, because that's how the checked attribute is defined. An implementation could not treat "no checked attribute" as checked without violating the spec and making the entire internet's checkboxes broken. That default cannot ever change.

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I would like to ensure that the renderer does not ever render an as checked by default.

This will never happen. A checkbox without checked is, by definition, unchecked, and will render as such.

I would like to demonstrate explicitly the intended check state for an in markup so that a checkbox cannot accidentally be determined to be erroneously (un)checked.

It looks like your current method of indicating this (a comment in the source) successfully handles this - it explicitly communicates your intent to other authors of the same file. It also has the advantage of already working, and letting you communicate arbitrary other information to future editors of the file that also aren't sufficiently explicit in the markup.

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#10537 (comment)

@tabatkins, how is a checkbox by definition unchecked? Isn't that merely a matter of convention? It seems feasible that an implementation could default to a checked state. For any attribute, surely having its opposite is solely an advantage, since it makes changing defaults easier, and makes authors more confident that were a default to change, it wouldn't impact them.

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