CSS Nesting
CSS nesting provides the ability to nest one style rule inside another, with the selector of the child rule relative to the selector of the parent rule. Similar behavior previously required a CSS pre-processor.
:optional CSS pseudo-class
The `:optional` pseudo-class matches form inputs (`<input>`, `<textarea>`, `<select>`) which are not `:required`.
htmlselectelement api: required
css selector: `:first-child`: matches elements with no parent
css selector: `:last-child`: matches elements with no parent
css selector: `:nth-child()`: matches elements with no parent
css selector: `:nth-last-child()`: matches elements with no parent
css selector: `:only-child`: matches elements with no parent
css selector: `:required`
html element: select: required
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