Add CSS styling examples to <hr> element documentation #42366
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This pull request adds practical examples of “appropriate CSS” for styling the
element. The new section demonstrates commonly used styles such as a simple solid line, a thicker line, a dashed line, and a decorative symbol using the ::after pseudo-element.
Motivation
The current documentation mentions that horizontal lines should be styled using CSS but does not provide examples. This update addresses #42363 by giving clear, modern CSS examples that help readers understand how to style
while preserving its semantic meaning.
Additional details
This update modifies only the documentation. No structural or behavioral changes were made to the page.
Live examples are unchanged; the update is purely educational.
Related issues and pull requests
Fixes #42363