The non-standard proprietary ::-webkit-input-placeholder pseudo-element represents the placeholder text of a form element. This allows web developers and theme designers to customize the appearance of placeholder text. This pseudo-class is only supported by WebKit and Blink.

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The :-moz-placeholder pseudo-class represents any form element displaying placeholder text. This allows web developers and theme designers to customize the appearance of placeholder text, which is a light grey color by default. This may not work well if you've changed the background color of your form fields to be a similar color, for example, so you can use this pseudo-class to change the placeholder text color.

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The :-moz-tree-row(hover) CSS pseudo-class will match an element if the mouse cursor is presently hovering over a tree row.

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The :-moz-window-inactive CSS pseudo-class matches any element while it's in an inactive window.

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The non-standard proprietary :-ms-input-placeholder pseudo-class represents the placeholder text of a form element. This allows web developers and theme designers to customize the appearance of placeholder text. This pseudo-class is only supported by Internet Explorer and Microsoft Edge.

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The <blend-mode> type is a collection of keywords describing blend modes.

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The box-suppress CSS property controls the box generation of an element.

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The display-inside CSS property specifies the inner display type of the box generated by an element, dictating how its contents lay out inside the box.

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The display-list CSS property specifies whether a list marker should be displayed for an element.

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The display-outside CSS property specifies the outer display type of the box generated by an element, dictating how the element participates in its parent formatting context.

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-ms-overflow-style is a proprietary CSS property, specific to Internet Explorer and Microsoft Edge, which controls the behavior of scrollbars when an element's content overflows.

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The scroll-snap-type-x CSS property defines how strictly snap points are enforced on the horizontal axis of the scroll container in case there is one.

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The scroll-snap-type-y CSS property defines how strictly snap points are enforced on the vertical axis of the scroll container in case there is one.

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On mobile devices, the text-size-adjust property allows Web authors to control if and how the text-inflating algorithm is applied to the textual content of the element it is applied to.

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The ::marker CSS pseudo-element represents the marker box of a list item (e.g. the bullet point or item number).

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The ::-ms-fill CSS pseudo-element represents the filled-in portion of a <progress> element. This pseudo-element is non-standard and specific to Internet Explorer 10+, hence the vendor prefix.

CSS Non-standard Pseudo-element Reference

The ::-webkit-progress-bar CSS pseudo-element represents the entire bar of a <progress> element. Normally it's only visible as the unfilled portion of the bar, since by default it's rendered below the ::-webkit-progress-value pseudo-element. It is a child of the ::-webkit-progress-inner-element pseudo-element and the parent of the ::-webkit-progress-value pseudo-element.

CSS Non-standard Pseudo-element Reference

The ::-webkit-progress-inner-element CSS pseudo-element represents the outermost, container pseudo-element of the <progress> element. It is the parent of the ::-webkit-progress-bar pseudo-element.

CSS Non-standard Pseudo-element Reference

The ::-webkit-progress-value CSS pseudo-element represents the filled-in portion of the bar of a <progress> element. It is a child of the ::-webkit-progress-bar pseudo-element.

CSS Non-standard Pseudo-element Reference