H — A–Z

Every CSS entry starting with H, grouped by kind. Pseudo-classes, pseudo-elements and types are filed by their first letter, ignoring the leading :, :: or <.

Name	Description
Color
`Highlight`	System colour: the background of selected text.
`HighlightText`	System colour: selected text.
`honeydew`	Named colour #f0fff0.
`hotpink`	Named colour #ff69b4.
Container feature
`height`	The height of the query container's content box.
Function
`hsl()`	An sRGB colour from hue, saturation and lightness.
`hsla()`	Legacy alias of hsl() with the same arguments.
`hue-rotate()`	A filter that rotates every hue by an angle.
`hwb()`	An sRGB colour from a hue plus amounts of white and black.
`hypot()`	The square root of the sum of squares of its arguments.
Media feature
`height`	The height of the viewport.
`horizontal-viewport-segments`	How many side-by-side segments a dual-screen viewport has.
`hover`	Whether the primary input device can hover.
Property
`hanging-punctuation`	Lets punctuation hang outside the line box.
`height`	The preferred vertical size of a box.
`hyphenate-character`	The string shown where a word is hyphenated.
`hyphenate-limit-chars`	Minimum word length and characters either side of a hyphen.
`hyphens`	Whether words may be hyphenated at line ends.
Pseudo-class
`:has()`	Matches an element by its descendants or following siblings: the parent selector.
`:has-slotted`	Matches a slot element that has content assigned to it.
`:heading`	Matches heading elements, h1 to h6.
`:host`	Inside a shadow tree, matches its shadow host element.
`:host()`	Matches the shadow host only if it also matches a given selector.
`:host-context()`	Deprecated: matches a shadow host by its ancestors. Chrome only.
`:hover`	Matches an element while the pointer is over it.
Pseudo-element
`::highlight()`	Styles text ranges registered with the CSS Custom Highlight API.
Type
`<hex-color>`	A colour written as # and 3, 4, 6 or 8 hexadecimal digits.
`<hue-interpolation-method>`	Which way round the hue wheel to travel when blending.
`<hue>`	The hue angle in a polar colour function.