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See also
Per-site user style sheet rules on the www-style mailing list
from the top result below
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/At-rules/@document
See also
Per-site user style sheet rules on the www-style mailing list
https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Fonts/OpenType_fonts
The answer lies in the specific features that will make a site more useful, readable, and polished:
Ligatures like 'ff' or 'fi' make letter spacing and reading more even and smooth
https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Text/Wrapping_breaking_text
If things were to disappear or be cropped as would happen if overflow was set to hidden you might not spot it when previewing your site
https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Grid_layout/Logical_values_and_writing_modes
Issues with physical properties
Physical properties can cause issues when developing a site that has to work in multiple languages, including languages where the text flows from right to left, or top to bottom
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/:-moz-suppressed
The :-moz-suppressed CSS pseudo-class is a Mozilla extension that matches elements representing images that were suppressed because loading images from the specified site has been blocked
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/forced-color-adjust
The second box will preserve the site colors set on the
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/At-rules/@font-palette-values/font-family
This can be useful when you want to update font colors to match your site's branding
https://developer.mozilla.org/docs/Web/CSS/Reference/At-rules/@view-transition
The demo uses cross-document view-transitions; a half second transition that occurs when navigating between two pages of a site
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/transform-function/scale
If you need to include such animations on your website, you should provide a control to allow users to turn off animations, preferably site-wide
https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Colors/Using_color_wisely
The wrong color choice can render your site unattractive, or worse, leave the content unreadable due to problems with contrast or conflicting colors
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/At-rules/@custom-media
orientation: portrait) {
}
If the breakpoint needs to be changed, it can be updated in one place to adjust all dependent media queries across the whole site
https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Grid_layout/Accessibility
This means that someone navigating using the keyboard could be tabbing through links on your site and suddenly find themselves jumping from the top to the bottom of the document due to a reordered item being next in the tab order
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/transform
If you need to include such animations on your website, you should provide a control to allow users to turn off animations, preferably site-wide
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/At-rules/@font-face/src
By discovering the set of user-installed fonts, a site can therefore build a fingerprint for the device, helping the site to track users across the web
https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Shapes/From_images
An image hosted on the same domain as your site should work, however, if your images are hosted on a different domain such as on a CDN you should ensure that they are sending the correct headers to enable them to be used for Shapes
https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Fonts/Variable_fonts
In such a scenario, to use a typeface for typical use on a site for body copy you would need at least four files: regular, italic, bold, and bold italic
https://developer.mozilla.org/en-US/docs/Web/CSS/How_to/Layout_cookbook/Breadcrumb_navigation
The items typically display inline, with a separator between each item, indicating the hierarchy between individual pages
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/text-anchor
Each individual text fragment within an element is aligned independently; thus, a multi-line <text> element will have each line of text aligned as per the value of text-anchor
https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Scrollbars_styling
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https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Fonts/WOFF
This improves availability of fonts to site designers
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/marker
The marker must have been defined using an SVG <marker> element, and can only be referenced with a <url> value
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/marker-end
The marker must have been defined using an SVG <marker> element, and can only be referenced with a <url> value
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/marker-start
The marker must have been defined using an SVG <marker> element, and can only be referenced with a <url> value
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/marker-mid
The marker must have been defined using an SVG <marker> element, and can only be referenced with a <url> value
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/:any-link
Skip to main content
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MDN
HTML
HTML: Markup language
HTML reference
Elements
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Attributes
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HTML cheatsheet
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See all…
Markup languages
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/:visited
The :visited pseudo-class applies only to <a> and <area> elements that have an href attribute
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/-webkit-text-stroke-color
Not all browsers may have implemented every part
https://developer.mozilla.org/en-US/docs/Web/CSS/How_to/Layout_cookbook/Pagination
To help with this we have added aria-label="pagination" on the <nav> element
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/transform-box
* Some parts of this feature may have varying levels of support
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/color_value/contrast-color
org (2025)
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