<hr>
A thematic break — a shift of scene or topic within a section.
Baseline: Widely available · Grouping content
When to use it
Between prose passages where the subject pivots, like a scene change in a story.
When not to
Not a visual divider or underline — if you only want a line, that's CSS border, not markup.
Example
…and that concluded the experiment.
Three years later, in another lab entirely…
<p>…and that concluded the experiment.</p>
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<p>Three years later, in another lab entirely…</p>