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https://drafts.csswg.org/cssom/#ref-for-concept-css-style-sheet-title-2 [[ Whenever the attribute is set, changed or removed, the title must be set to the new value of the attribute, or to the empty string if the attribute is absent. ]] When title changes, need to set the preferred stylesheet appropriately. Probably also when a stylesheet is disabled/enabled, etc.
Created attachment 1638 [details] Change preferred set on title modification Added demo for modifying title. Currently affects preferred set in Gecko, not in Blink.