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Same-document navigation follows a different code path than normal navigation and was therefore not covered in the initial implementation for text fragments. Same-document navigation does not set a URI in the `Document`, which is the way cross-document navigation would parse text directives from the URL. Instead, `nsDocShell::ScrollToAnchor()` is called via `nsDocShell::InternalLoad()`-> `nsDocShell::HandleSameDocumentNavigation()`. This code path needs to parse and remove the fragment directive from the new fragment to be able to find text fragments and to allow for element-id fallback. `nsDocShell::ScrollToAnchor()` needs to start an attempt to scroll to the text fragment if it exists. It must not, however, clear the uninvoked text directives, because a same-document navigation could happen before the document is fully loaded, hence the target text might not be part of the DOM tree. As per spec, a second attempt to scroll to the text fragment is done after the load is completed. This is done by `Document::ScrollToRef()`, which is called by `nsDocumentViewer::LoadComplete()` after the load has finished. This call will clear the uninvoked directives. Differential Revision: https://phabricator.services.mozilla.com/D209726 |
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