Heads up: refs to pagevisibility about to be removed
#95
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rakuco
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Mar 8, 2024
The original main goal was to give a name to the existing algorithm that used to run in the "next animation frame task" so that it could be referenced in the upcoming WebDriver section, but "animation frame task" as a concept did not exist, and one thing led to another and the final change includes a better version of the original algorithms, but without any user-visible changes. This change borrows a lot of ideas from the Screen Orientation spec as of its 2023-08-09 Editor's Draft. Most important changes: - The "update the device posture information" algorithm was renamed to "calculate the device posture information" so that it returns a value instead of updating `[[CurrentPosture]]` directly -- that is done as task queued in the user interaction task source (more on this below). - Call the main algorithm "device posture change steps". - Merge the separate page visibility-related algorithm into the main one, and add the proper checks to it to ensure that documents whose visibility state is "hidden" are not updated and that calls to "update the device posture information" that result in the same value being stored do not fire any "change" events. - The "change" event is now queued to be fired in the user interaction task source so that the moment it is actually fired is more predictable (the "device posture change steps" are not running at any specific point of the HTML event loop). While here: the definition of the `onchange` attribute was updated to mention the current terms defined in the HTML spec, along with a proper `<dfn>` for the event handler event type. The language and the references used in the text have also been updated: we no longer deal with browsing contexts, but with navigables; the PAGE-VISIBILITY spec is no longer treated as a separate specification, as it was merged into HTML a few years ago. Related to w3c#104. Fixes w3c#95.
rakuco
pushed a commit
that referenced
this issue
Mar 8, 2024
The original main goal was to give a name to the existing algorithm that used to run in the "next animation frame task" so that it could be referenced in the upcoming WebDriver section, but "animation frame task" as a concept did not exist, and one thing led to another and the final change includes a better version of the original algorithms, but without any user-visible changes. This change borrows a lot of ideas from the Screen Orientation spec as of its 2023-08-09 Editor's Draft. Most important changes: - The "update the device posture information" algorithm was renamed to "calculate the device posture information" so that it returns a value instead of updating `[[CurrentPosture]]` directly -- that is done as task queued in the user interaction task source (more on this below). - Call the main algorithm "device posture change steps". - Merge the separate page visibility-related algorithm into the main one, and add the proper checks to it to ensure that documents whose visibility state is "hidden" are not updated and that calls to "update the device posture information" that result in the same value being stored do not fire any "change" events. - The "change" event is now queued to be fired in the user interaction task source so that the moment it is actually fired is more predictable (the "device posture change steps" are not running at any specific point of the HTML event loop). While here: the definition of the `onchange` attribute was updated to mention the current terms defined in the HTML spec, along with a proper `<dfn>` for the event handler event type. The language and the references used in the text have also been updated: we no longer deal with browsing contexts, but with navigables; the PAGE-VISIBILITY spec is no longer treated as a separate specification, as it was merged into HTML a few years ago. Related to #104. Fixes #95.
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See w3c/page-visibility#73
Most of the page visibility spec is moving into the HTML Spec (see whatwg/html#7153), and calls are to be made explicitly instead of the "hook" (
external-now-visible-algorithm).Since this spec appears to rely on this ref, opening this issue to track switching to being called directly.
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