The :read-only CSS pseudo-class matches when an element is not writable by the user.

CSS CSS Pseudo-class Layout Reference Web

The :read-write CSS pseudo-class matches when an element is editable by user like text input elements.

CSS CSS Pseudo-class Layout Reference Web

The :target pseudo-class represents the unique element, if any, with an id matching the fragment identifier of the URI of the document.

CSS CSS Pseudo-class Layout Reference Web

The :-webkit-autofill CSS pseudo-class matches when an <input> element has its value autofilled by the browser.

CSS NeedsExample Non-standard Pseudo-class Reference

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.

CSS CSS Pseudo-class CSS Reference Non-standard Pseudo-class Reference

The :default CSS pseudo-class represents any user interface element that is the default among a group of similar elements.

CSS CSS Pseudo-class Layout NeedsMobileBrowserCompatibility Reference Web

The :first @page CSS pseudo-class describes the styling of the first page when printing a document.

CSS CSS Pseudo-class Layout NeedsMobileBrowserCompatibility Reference Web

The :fullscreen CSS pseudo-class applies to any element that's currently being displayed in full-screen mode. It selects not only to the top level element, but to the whole stack of elements that appears.

CSS CSS Pseudo-class Experimental Full-screen Reference

The :hover CSS pseudo-class matches when the user designates an element with a pointing device, but does not necessarily activate it. This style may be overridden by any other link-related pseudo-classes, that is :link, :visited, and :active, appearing in subsequent rules. In order to style appropriately links, you need to put the :hover rule after the :link and :visited rules but before the :active one, as defined by the LVHA-order: :link — :visited — :hover — :active.

CSS CSS Pseudo-class Layout NeedsMobileBrowserCompatibility Reference Référence Web

The :invalid CSS pseudo-class represents any <input> or <form> element whose content fails to validate according to the input's type setting. This allows you to easily have invalid fields adopt an appearance that helps the user identify and correct errors.

CSS CSS Pseudo-class Layout NeedsMobileBrowserCompatibility Reference Web

The :last-child CSS pseudo-class represents any element that is the last child element of its parent.

CSS CSS Pseudo-class Layout Reference Référence Web

The :left CSS page pseudo-class matches any left page when printing a page. It allows to describe the styling of left-side pages.

CSS CSS Pseudo-class Layout NeedsMobileBrowserCompatibility Reference Web

The :link CSS pseudo-class lets you select links inside elements. This will select any link which has not yet been visited, even those already styled using selector with other link-related pseudo-classes like :hover, :active or :visited. In order to appropriately style links, you need to put the :link rule before the other ones, as defined by the LVHA-order: :link — :visited — :hover — :active. The :focus pseudo-class is usually placed right before or right after :hover, depending on the expected effect.

CSS CSS Pseudo-class Layout Reference Référence Web

The :-moz-full-screen-ancestor CSS pseudo-class applies to all ancestors of the full-screen element, except containing frames in parent documents, which are the full-screen element in their own documents. However, those elements' ancestors have this class applied to them.

CSS CSS Reference NeedsCompatTable NeedsExample Non-standard Pseudo-class

The :-moz-locale-dir(ltr) CSS pseudo-class matches an element if the user interface is being displayed left-to-right. This is determined by the preference intl.uidirection.locale (where locale is the current locale) being set to "ltr".

CSS CSS Reference Localization NeedsCompatTable NeedsExample Non-standard Pseudo-class

The :-moz-only-whitespace CSS pseudo-class matches an element that has no child nodes at all or empty text nodes or text nodes that have only white-space in them. Only when there are element nodes or text nodes with one or more characters inside the element, the element doesn't match this pseudo-class anymore.

CSS CSS Reference NeedsCompatTable Non-standard Pseudo-class

CSS CSS Pseudo-class CSS Reference Non-standard

The :-moz-system-metric(scrollbar-end-backward) CSS pseudo-class will match an element if the computer's user interface includes a backward arrow button at the end of scrollbars.

CSS CSS Pseudo-class CSS Reference NeedsContent NeedsExample Non-standard

The :-moz-system-metric(scrollbar-end-forward) CSS pseudo-class will match an element if the computer's user interface includes a forward arrow button at the end of scrollbars.

CSS CSS Pseudo-class CSS Reference NeedsContent NeedsExample Non-standard

The :-moz-system-metric(scrollbar-start-backward) CSS pseudo-class will match an element if the computer's user interface includes a backward arrow button at the start of scrollbars.

CSS CSS Pseudo-class CSS Reference NeedsContent NeedsExample Non-standard