HTML tags must be used for their intended purpose, not for the visual effect they provide.
For example:
| Tags | Incorrect usage | Correct usage |
|---|---|---|
<blockquote> | Indent text | Tag a block quote |
<ul> and <li> | Display a bullet point | Tag lists |
<fieldset> | Display a border | Group related form items |
<h1> to <h6> | Display larger or smaller text sizes | Define heading levels in hierarchy |