@import - CSS: Cascading Style Sheets
the @import css at-rule is used to import style rules from other style sheets.
... syntax @import url; @import url list-of-media-queries; @import url supports( supports-query ); @import url supports( supports-query ) list-of-media-queries; where: url is a <string> or a <url> representing the location of the resource to import.
... description imported rules must precede all other types of rules, except @charset rules; as it is not a nested statement, @import cannot be used inside conditional group at-rules.
...And 8 more matches

CSSStyleSheet.ownerRule - Web APIs
the read-only cssstylesheet property ownerrule returns the cssimportrule corresponding to the @import at-rule which imported the stylesheet into the document.
... if the stylesheet wasn't imported into the document using @import, the returned value is null.
... syntax var ownerrule = cssstylesheet.ownerrule; value a cssimportrule corresponding to the @import rule which imported the stylesheet into the document.
...And 3 more matches

CSSStyleSheet - Web APIs
for example, one rule might be a cssstylerule object containing a style such as: h1, h2 { font-size: 16pt; } another rule might be an at-rule such as @import or @media, and so forth.
... ownerrule read only if this stylesheet is imported into the document using an @import rule, the ownerrule property returns the corresponding cssimportrule; otherwise, this property's value is null.
... stylesheets list getting the owner element/rule given the style sheet object the interface for the owner object getting the cssstylesheet object from the owner <style> and <link> elements in the document yes .ownernode htmllinkelement, htmlstyleelement, or svgstyleelement .sheet css @import rule in other style sheets applied to the document yes .ownerrule cssimportrule .stylesheet <?xml-stylesheet ?> processing instruction in the (non-html) document yes .ownernode processinginstruction .sheet http link header yes n/a n/a n/a user agent (default) style sheets no n/a n/a n/a specifications spec...

Skinning XUL Files by Hand - Archive of obsolete content
to keep your xul looking consistent and to avoid breaking skins altogether (when your styles have some dependency on a part of the global skin that changes, such as an image), use the style rules in the global skin by importing it into your stylesheet with the following instruction: @import url("chrome://global/skin/"); refer to the document writing skinnable xul and css for guidelines on how to make your skins friendly to the global skin, to xul, and to mozilla.
... add the following lines to the file: @import url(chrome://global/skin/); box#bbox { background-color: lightgrey; } button#rd { background-color: red; color: white; } save it in the same directory as your xul file.

Using the standard theme - Archive of obsolete content
you can either add multiple <tt>xml-stylesheet</tt> processing instructions to your xul file, or create an <tt>@import</tt> chain.
... multiple <tt>xml-stylesheet</tt> processing instructions simply add one <tt>xml-stylesheet</tt> processing instruction for every style sheet you want to associate with your xul file: <?xml-stylesheet href="chrome://global/skin/" type="text/css"?> <?xml-stylesheet href="chrome://myextension/skin/custom.css" type="text/css"?> <tt>@import</tt> chains first, import the global skin in your custom style sheet using the css <tt>@import</tt> rule: @import url("chrome://global/skin/"); you then have to associate your xul file with your custom style sheet only: <?xml-stylesheet href="chrome://myextension/skin/custom.css" type="text/css"?> applying different custom style sheets depending on the selected theme mozilla is able to automa...

Writing Skinnable XUL and CSS - Archive of obsolete content
this is done using an @import directive placed at the top of the file.
... @import url(chrome://global/skin/) ...

Browser Detection and Cross Browser Support - Archive of obsolete content
for example, navigator 4 does not understand the @import directive in css and will not load any external css style sheets specified via @import.
... <style type="text/css"> /* navigator 4 css rules */ </style> <style type="text/css"> /* advanced css rules ignored by navigator 4 */ @import "advanced.css"; </style> a similar technique is available for hiding css rules from navigator 4 using the fact that navigator 4 will ignore css rules after an occurence of /*/*/ in a stylesheet.

CSSRule - Web APIs
"h1,h2 { font-size: 16pt }" or "@import 'url'".
...the relationships between these constants and the interfaces are: type value rule-specific interface comments and examples cssrule.style_rule 1 cssstylerule the most common kind of rule: selector { prop1: val1; prop2: val2; } cssrule.import_rule 3 cssimportrule an @import rule.

CSSStyleSheet.insertRule() - Web APIs
if trying to insert an @import at-rule after a style rule, the method aborts with a hierarchyrequesterror.
... if rule is @namespace and the rule-list has more than just @import at-rules and/or @namespace at-rules, the method aborts with an invalidstateerror.

FetchEvent.respondWith() - Web APIs
this means, for example, if a service worker intercepts a stylesheet or worker script, then the provided response.url will be used to resolve any relative @import or importscripts() subresource loads (bug 1222008).
... if a stylesheet is intercepted, then the final url is used as the base url for resolving relative @import loads.

Media queries - CSS: Cascading Style Sheets
use @import to conditionally apply an entire style sheet.
... reference at-rules @import @media guides using media queries introduces media queries, their syntax, and the operators and media features which are used to construct media query expressions.

Media - Progressive web apps (PWAs)
in css, you can use @import at the start of a stylesheet to import another stylesheet from a url, optionally specifying the media type.
... read the @import reference page to find details of how to import the new print-specific css file into your style4.css stylesheet.

CSS3 - Archive of obsolete content
clarifies: interaction of media-dependent @import statements and style sheet loading requirements.

Style System Overview - Archive of obsolete content
eets & rules nsistyleruleprocessor and nsistylesheet describe in c++ what a css stylesheet can do nsistylerule describes in c++ what a css style rule can do main implementations are for css, but we have other implementations in c++ that: do what css can't do do things faster than css would css style sheets at basic level, sheet is collection of rules other special things: @import, @media, @namespace, etc.

Adding Style Sheets - Archive of obsolete content
this can be done with the code below, allowing you to remove the import from the xul file: style import from xul: <?xml-stylesheet href="chrome://global/skin/" type="text/css"?> style import from css: @import url(chrome://global/skin/); the second syntax is preferred because it reduces the number of dependencies within the xul file itself.