Values economy The user agent is allowed to make adjustments to the element as it deems appropriate and prudent in order to optimize the output for the device it's being rendered for.
Sending a client request Once the connection is established, the user-agent can send the request a user-agent is typically a web browser, but can be anything else, a crawler, for example.
For instance, HTML allows authors to specify a heading with the H1 element, so a user agent that implements HTML can recognize that content as a heading.
This is generally currentcolor, but the user agent may choose a different color to ensure good visibility and contrast with the surrounding content, taking into account the value of currentcolor, the background, shadows, and other factors.
User agents may allow users to follow such citation links, but they are primarily intended for private use(e.g., by server-side scripts collecting statistics about a site's use of quotations), not for readers.
User agents are encouraged to vary the frequency of the event based on the system load and the average cost of processing the event each time, so that the UI updates are not any more frequent than the user agent can comfortably handle while decoding the video.
For example, since the"&" is not a valid token in a CSS2 selector, a CSS2 user agent must ignore the whole second line, and not set the color of H3 to red.
When a media element is popped off the stack of open elements of an HTML parser or XML parser, the user agent must honor user preferences for automatic text track selection, populate the list of pending text tracks, and set the element's blocked-on-parser flag to false.
For the purposes of round-tripping or communicating with other services that expect language tags, user agents should pass unknown language tags through unmodified, and tagged as being BCP 47 language tags, so that subsequent services do not interpret the data as another type of language description.
This means that authors cannot use the isindex or the plaintext element, but user agents are required to support them in a way that is compatible with how these elements need to behave for compatibility with deployed content.
To enable authors to use SVG tools that only accept SVG in its XML form, interactive HTML user agents are encouraged to provide a way to export any SVG fragment as a namespace-well-formed XML fragment.
The user agent will pick a width from the sizes attribute, using the first item with a<media-condition>(the part in parentheses) that evaluates to true, or using the last item(calc(33vw- 100px)) if they all evaluate to false.
This means that authors can not use the isindex or plaintext element, but user agents are required to support them in a way that is compatible with how these elements need to behave for compatibility with deployed content.
When the user agent validates the server's response during the"establish a WebSocket connection" algorithm, if the status code received from the server is not 101(e.g. it is a redirect), the user agent must fail the WebSocket connection.
User agents may use the element's language to determine proper processing or rendering(e.g. in the selection of appropriate fonts or pronunciations, for dictionary selection, or for the user interfaces of form controls such as date pickers).
A type that the user agent knows it cannot render is one that describes a resource that the user agent definitely does not support, for example because it doesn't recognize the container type, or it doesn't support the listed codecs.
Although it is hoped that the in-progress SVG 2 specification is a more realistic target for implementations, until that specification is ready, user agents that implement SVG must do so with the following willful violations and additions.
Value A space-separated list of element IDs Possible effects on user agents and assistive technology When user agents compute the accessible name property of elements that have both an aria-labelledby attribute and an aria-label attribute, the user agents give precedence to aria-labelledby.
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