Use appropriate elements and/or CSS instead.
Where the tt element would have been used for marking up keyboard input, consider the kbd element; for variables, consider the var element; for computer code, consider the code element; and for computer output, consider the samp element.
Similarly, if the u element is being used to indicate emphasis, consider using the em element; if it is being used for marking up keywords, consider the b element; and if it is being used for highlighting text for reference purposes, consider the mark element.
See also the text-level semantics usage summary for more suggestions with examples.
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