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bug#68508: [PATCH] ; (dom-print): Use HTML entities for reserved charact

From: Eli Zaretskii
Subject: bug#68508: [PATCH] ; (dom-print): Use HTML entities for reserved characters.
Date: Tue, 16 Jan 2024 15:47:30 +0200 
> Date: Tue, 16 Jan 2024 14:24:40 +0100
> From:  Eshel Yaron via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> This makes `dom-print` encode HTML reserved characters that occur in
> string elements of the DOM, to ensure the validity of the result.
> 
> For example, put the following in `foo.html`:
> 
> --8<---------------cut here---------------start------------->8---
> <html><body>
> Add ‘<samp class="samp">&lt;div class="default"&gt; &lt;/div&gt;</samp>’ tags 
> around the fontified body.
> <body><html>
> --8<---------------cut here---------------end--------------->8---
> (Fragment from 
> https://www.gnu.org/software/emacs/manual/html_mono/htmlfontify.html)
> 
> Open that file in Emacs and say `M-: (require 'dom)` and then
> `(dom-print (libxml-parse-html-region))` in the HTML buffer.  This
> produces invalid HTML since `libxml-parse-html-region` correctly decodes
> HTML entities, but `dom-print` doesn't encode (without this patch).

Thanks, but could you please also add tests for this?
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