CSS entries starting with a symbol

Every at-rule, plus the entries whose names start with a symbol rather than a letter: custom properties (--*), legacy -webkit- names, and the selector symbols such as &, *, ., # and [ ].

Name	Description
At-rule
`@annotation`	An @font-feature-values block naming annotation alternates.
`@bottom-center`	A page-margin rule for the centre box in the bottom margin.
`@bottom-left`	A page-margin rule for the left box in the bottom margin.
`@bottom-left-corner`	A page-margin rule for the bottom-left corner box of a printed page.
`@bottom-right`	A page-margin rule for the right box in the bottom margin.
`@bottom-right-corner`	A page-margin rule for the bottom-right corner box of a printed page.
`@character-variant`	An @font-feature-values block naming character variants.
`@charset`	Declares the character encoding at the very start of a style sheet.
`@container`	Applies rules based on the size or state of an ancestor container.
`@counter-style`	Defines a custom counter style for list markers and counters.
`@font-face`	Defines a downloadable web font and the faces it covers.
`@font-feature-values`	Names a font's alternate glyphs for use in font-variant-alternates.
`@font-palette-values`	Defines a named custom colour palette for a colour font.
`@function`	Defines a custom function that takes arguments and returns a value.
`@historical-forms`	An @font-feature-values block for historical forms.
`@import`	Loads another style sheet, optionally into a layer or under a condition.
`@keyframes`	Defines a named animation as a list of keyframes.
`@layer`	Declares a cascade layer, so groups of rules win or lose by layer order.
`@left-bottom`	A page-margin rule for the bottom box in the left margin.
`@left-middle`	A page-margin rule for the middle box in the left margin.
`@left-top`	A page-margin rule for the top box in the left margin.
`@media`	Applies rules when a media query about the device or viewport matches.
`@namespace`	Declares an XML namespace or namespace prefix for selectors.
`@ornaments`	An @font-feature-values block naming ornament glyphs.
`@page`	Styles printed page boxes: size, orientation and margins.
`@position-try`	Defines a named fallback position for an anchor-positioned box.
`@property`	Registers a typed custom property that can be animated.
`@right-bottom`	A page-margin rule for the bottom box in the right margin.
`@right-middle`	A page-margin rule for the middle box in the right margin.
`@right-top`	A page-margin rule for the top box in the right margin.
`@scope`	Limits rules to a subtree, optionally stopping at a lower boundary.
`@starting-style`	The styles a newly shown element transitions from.
`@styleset`	An @font-feature-values block naming stylistic sets.
`@stylistic`	An @font-feature-values block naming stylistic alternates.
`@supports`	Applies rules only if the browser supports a declaration or feature.
`@swash`	An @font-feature-values block naming swash alternates.
`@top-center`	A page-margin rule for the centre box in the top margin.
`@top-left`	A page-margin rule for the left box in the top margin.
`@top-left-corner`	A page-margin rule for the top-left corner box of a printed page.
`@top-right`	A page-margin rule for the right box in the top margin.
`@top-right-corner`	A page-margin rule for the top-right corner box of a printed page.
`@view-transition`	Opts a page in to view transitions across navigations.
Combinator
`+`	Next-sibling combinator: matches the element immediately after another.
`>`	Child combinator: matches elements whose parent matches the left side.
`~`	Subsequent-sibling combinator: matches any later sibling of another element.
Keyword
`-infinity`	Math constant: the smallest possible value, clamped to the allowed range.
Property
`--*`	Custom properties: author-named values read with var().
`-webkit-box-align`	Legacy box cross-axis alignment. Deprecated; use align-items.
`-webkit-box-flex`	How much a legacy box child grows. Deprecated; use flex-grow.
`-webkit-box-ordinal-group`	Reorders a legacy box child. Deprecated; use order.
`-webkit-box-orient`	Legacy box direction, still used for line clamping. Deprecated; use flex-direction.
`-webkit-box-pack`	Legacy box packing along its direction. Deprecated; use justify-content.
`-webkit-line-clamp`	Clamps a block to a number of lines, ending with an ellipsis.
`-webkit-text-fill-color`	The fill colour of text glyphs, overriding color for the fill.
`-webkit-text-stroke`	Shorthand for the width and colour of an outline around text.
`-webkit-text-stroke-color`	The colour of the outline around text.
`-webkit-text-stroke-width`	The width of the outline around text.
Selector
`#id`	ID selector: matches the element with a given id attribute.
`&`	The nesting selector: stands for the parent rule's selector in nested CSS.
`*`	The universal selector: matches every element.
`.class`	Class selector: matches elements with a given word in their class attribute.
`[attr]`	Attribute selectors: match on an attribute being present or on its value.