A popover is an interactive HTML tooltip. It can be a dropdown, menu, or any other kind of box that pops out from the normal flow of the document. This type of element contains non-vital functionality and can be hidden behind a click or hover to conserve space.

A hyponym refers to a type. A meronym refers to a part. For example, a hyponym of tree is pine tree or oak tree (a type of tree), but a meronym of tree is bark or leaf (a part of tree).

Software engineering is a supreme science and web development is a part of it.

Escaping is a subset of encoding, where not all characters need to be encoded. Only some characters are encoded (by using an escape character).

Co-hyponyms are labelled as such when separate hyponyms share the same hypernym but are not hyponyms of one another, unless they happen to be synonymous