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CSS line-clamp

Proprietary and undocumented CSS property that will contain text to a given amount of lines when used in combination with display: -webkit-box. It will end with ellipsis when text-overflow: ellipsis is included.

Explicit descendant combinator >>

An explicit, non-whitespace spelling of the descendant combinator. A >> B is equivalent to A B.

Media Queries: interaction media features

Allows a media query to be set based on the presence and accuracy of the user's pointing device, and whether they have the ability to hover over elements on the page. This includes the pointer, any-pointer, hover, and any-hover media features.

CSS widows & orphans

CSS properties to control when lines break across pages or columns by defining the amount of lines that must be left before or after the break.

selector list argument of :nth-child and :nth-last-child CSS pseudo-classes

The newest versions of :nth-child() and :nth-last-child() accept an optional of S clause which filters the children to only those which match the selector list S. For example, :nth-child(1 of .foo) selects the first child among the children that have the foo class (ignoring any non-foo children which precede that child). Similar to :nth-of-type, but for arbitrary selectors instead of only type selectors.

CSS zoom

Non-standard method of scaling content.

selector list argument of :not()

Selectors Level 4 allows the :not() pseudo-class to accept a list of selectors, which the element must not match any of. Selectors Level 3 only allowed :not() to accept a single simple selector. Thus, :not(a):not(.b):not([c]) can instead be written as :not(a, .b, [c])

CSS ::marker pseudo-element

The ::marker pseudo-element allows list item markers to be styled or have their content value customized.

Dialog element

Method of easily creating custom dialog boxes to display to the user with modal or non-modal options. Also includes a ::backdrop pseudo-element for behind the element.

Custom Elements v0

Method of defining new HTML tags.

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