* Add `wp_remove_surrounding_empty_script_tags()` to more precisely remove script tag wrappers and warn when doing it wrong.
* Add clarifying comments for XML escaping logic in `wp_get_inline_script_tag()`.
* Leverage `WP_HTML_Tag_Processor` in `test_remove_frameless_preview_messenger_channel`.
* Reuse `assertEqualMarkup` in `test_blocking_dependent_with_delayed_dependency`.
* Normalize whitespace in `parse_markup_fragment` for `assertEqualMarkup`.
Follow-up to [56687].
Props dmsnell, westonruter, flixos90.
See #58664.
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