Well-formed tag
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In web page design, a well-formed tag is one that is either
- opened and closed,
- an empty element, which still must be terminated,
and is properly nested and does not overlap.
For example, in HTML: <b>word</b> is a well-formed tag, while <i><b>word</i> is not, since the bold tag is not closed. Empty elements (tags without text in between) can be closed by putting a slash at the end of the tag, i.e. <img />.