Day 19

 span> An element <span>is a generic inline container, which does not represent a specific type of content, and can be grouped together for styling (either using the idor property class) or because the elements share a property such as the lang.

<strong> The element gives <strong>importance to the text contained within it, and the text is usually displayed in bold.

<sub> Representing a portion of text that should be displayed at a lower (and often smaller) level than the main level of text.

<sup> Representing a portion of text that should be displayed at a higher (and often smaller) level than the main level of text