HTML tags should be '''nested''' in a proper order, meaning that the tag opened most recently is always the next tag to close. Example if you open a '''SPAN''' inside a '''DIV''' make sure you close the '''SPAN''' before you close the '''DIV'''.
[[File:A11y-nested.png|thumb|none|alt=Screenshot of good and bad nested tags|800px|Nest tags in proper order.]]
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