Curated by @SajalShlan
<meter>
To represent a scalar measurement within a known range, or a fractional value.
<progress>
To notify users of the progress of a download or task. It has two attributes: value (to specify the state of the progress) and max (to indicate the maximum value to reach).
<pre>
To show preformatted text as it appears in the source. What this means is that multiple whitespace characters won’t be collapsed into one (changing the default manner that browsers handle whitespace).
<small>
To represent text often found in small print like disclaimers, caveats, legal restrictions, or copyrights.
<output>
To represent the result of a calculation. Its main attribute is for, which contains a list of space-separated IDs of the elements that went into the calculation, or that otherwise influenced the calculation.
<noscript>
For displaying alternate HTML content if the browser does not support JavaScript.
<datalist>
To provide an "autocomplete" feature for <input> elements.
<kbd>
Denotes a key on the keyboard.
<download>
Instructs the browser to download a URL instead of navigating to it.
<spellcheck>
To check spelling and grammer.