For accessibility, at a minimum, we need to notify accessibility APIs of the node to which the page has scrolled. See nsAccessibilityService::NotifyOfAnchorJumpTo. Even with this, significant parts of this feature will be inaccessible: 1. There is no way for an assistive technology user to perceive the exact text which is visually highlighted. They only know about the node in which the text begins. 2. There is no way for an assistive technology user to perceive any text directives other than the first. We should ideally figure out and implement these before we ship this.
Bug 1753933 Comment 4 Edit History
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For accessibility, at a minimum, we need to notify accessibility APIs of the node to which the page has scrolled. See nsAccessibilityService::NotifyOfAnchorJumpTo. Even with this, significant parts of this feature will be inaccessible: 1. There is no way for an assistive technology user to perceive the exact text which is visually highlighted. They only know about the node in which the text begins. 2. There is no way for an assistive technology user to perceive any text directives other than the first. We should ideally figure out and implement these before we ship this. See also https://github.com/WICG/scroll-to-text-fragment/issues/142#issuecomment-1709325246