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HTML/CSSBeginner#html#semantics

What is the difference between <b>/<i> and <strong>/<em>?

<b> and <i> are purely presentational (bold/italic with no semantic meaning). <strong> conveys strong importance and <em> conveys stress emphasis — both carry semantic weight that assistive technologies announce differently.

Example
<p><strong>Warning:</strong> This action is <em>irreversible</em>.</p>

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