I know about
code
kbd
<p>Then you should press <kbd>Enter</kbd> key or just press <ui>OK</ui> button.</p>
Is there a tag for user interface elements?
The appropriate element for marking up user input is <kbd>
.
The
<kbd>
element represents user input (typically keyboard input, although it may also be used to represent other input, such as voice commands).
Emphasis mine
So your example would be appropriately marked up using:
<p>Then you should press <kbd>Enter</kbd> key or just press <kbd>OK</kbd> button.</p>