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:-moz-drag-over

The :-moz-drag-over CSS pseudo-class is used to edit an element when a drag-over event is called on it.
CSS CSS Reference NeedsCompatTable Non-standard

:-moz-first-node

The :-moz-first-node CSS pseudo-class represents any element that is the first child node of some other element. It differs from :first-child because it does not match a first child element with (non-whitespace) text before it.
CSS CSS Reference NeedsCompatTable Non-standard

:-moz-focusring

The :-moz-focusring CSS pseudo-class is similar to the :focus pseudo-class, but it only matches an element if the element is currently focused and a focus ring or other indicator should be drawn for that element. If :-moz-focusring matches, then :focus also matches, but the converse is not always true - it depends on whether the user agent has focus ring drawing enabled and how the element was focused. Whether the user agent has focus ring drawing enabled can depend on things like the settings of the operating system the user is using, so the precise behavior of this pseudo-class can vary from platform to platform depending on each platforms' particular focus best practices (defaults) or user modified settings.
CSS CSS Reference NeedsLiveSample Non-standard

:-moz-last-node

The :-moz-last-node CSS pseudo-class matches an element that is the last child node of some other element. It differs from :last-child because it does not match a last child element with (non-whitespace) text after it.
CSS CSS Reference NeedsCompatTable Non-standard

::-moz-list-bullet

The non-standard ::-moz-list-bullet Mozilla CSS pseudo-element is used to style the bullet of a list element.
CSS CSS Reference NeedsCompatTable Non-standard

:-moz-lwtheme-darktext

The :-moz-lwtheme-darktext pseudo-class matches in chrome documents when :-moz-lwtheme is true and a lightweight theme with a dark text color is selected.
CSS CSS Reference Non-standard Themes

:-moz-system-metric(mac-graphite-theme)

:-moz-system-metric(mac-graphite-theme) will match an element if the user has chosen the "Graphite" appearance in the "Appearance" prefpane of the Mac OS X System Preferences.
CSS CSS Reference NeedsCompatTable Non-standard

@counter-style

The @counter-style CSS at-rule lets authors define specific counter styles that are not part of the predefined set of styles. A @counter-style rule defines how to convert a counter value into a string representation.
At-rule counter CSS Reference Styles

bleed

The bleed at-rule descriptor specifies the extent of the page bleed area outside the page box. This property only has effect if crop marks are enabled using the marks property.
CSS CSS Reference NeedsBrowserCompatibility NeedsLiveSample NeedsMobileBrowserCompatibility

Attribute selectors

Attribute selectors select an element using the presence of a given attribute or attribute value.
Beginner beginner CSS CSS Reference Selectors

azimuth

In combination with elevation, azimuth enables different audio sources to be positioned spatially for aural presentation. This is important in that it provides a natural way to tell several voices apart, as each can be positioned to originate at a different location on the sound stage. Stereo output produce a lateral sound stage, while binaural headphones and multi-speaker setups allow for a fully three-dimensional stage.
CSS CSS Reference NeedsBrowserCompatibility NeedsMobileBrowserCompatibility NeedsUpdate

Child selectors

The > combinator separates two selectors and matches only those elements matched by the second selector that are direct children of elements matched by the first. By contrast, when two selectors are combined with the descendant selector, the combined selector expression matches those elements matched by the second selector for which there exists an ancestor element matched by the first selector, regardless of the number of "hops" up the DOM.
Beginner beginner CSS CSS Reference NeedsMobileBrowserCompatibility Selectors

CSS Box Model

CSS Box Model is a CSS module that defines the rectangular boxes, including their padding and margin, that are generated for elements and laid out according to the visual formatting model.
CSS CSS Box Model CSS Reference Overview

CSS Conditional Rules

CSS Conditional Rules is a CSS module that allows to define a set of rules that will only apply based on the capabilities of the processor or the document the style sheet is being applied to.
CSS CSS Conditional Rules CSS Reference Overview

CSS Flexible Box Layout

CSS Flexible Box Layout is a module of CSS that defines a CSS box model optimized for user interface design. In the flex layout model, the children of a flex container can be laid out in any direction, and can “flex” their sizes, either growing to fill unused space or shrinking to avoid overflowing the parent. Both horizontal and vertical alignment of the children can be easily manipulated. Nesting of these boxes (horizontal inside vertical, or vertical inside horizontal) can be used to build layouts in two dimensions.
CSS CSS Flexible Boxes CSS Reference Overview

CSS Generated Content

CSS Generated Content is a module of CSS that defines how to add content to an element.
CSS CSS Generated Content CSS Reference Overview

CSS Images

CSS Images is a module of CSS that defines what types of images can be used (the <image> type, containing URLs, gradients and other types of images), how to resize them and how they, and other replaced content, interact with the different layout models.
CSS CSS Images CSS Reference Overview

CSS Pages

CSS Pages is a module of CSS that defines how page switches are handled, as well as orphans and widows.
CSS CSS Pages CSS Reference Overview

CSS Positioning

CSS Positioning is a module of CSS that defines how to absolutely and relavitely position elements on the page.
CSS CSS Positioning CSS Reference Overview