RFR: 8338133: Cleanup direct use of `new HtmlTree`

[Jonathan Gibbons]

On Mon, 2 Sep 2024 11:20:24 GMT, Hannes Wallnöfer <hannesw at openjdk.org> wrote:

> The inconsistent use of HtmlTree has bugged me for a long time.

Yes, me too.  It helped to think of adding `HtmlTree.of(HtmlTag)` for the outlier cases. and we might want to add overloads that take an `HtmlId` and/or `HtmlStyle`.

A separate implementation-cleanup might be to regularize the use of `of` and/or constructors within `HtmlTree` itself, but that is of lesser use than regularizing client use of the class.

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PR Comment: https://git.openjdk.org/jdk/pull/20778#issuecomment-2327196757