This is a prerequisite to implement hyperlinks in PDF output (bug 454059), because the current version of cairo we have in the tree doesn't include the necessary APIs (`cairo_tag_begin`, `cairo_tag_end`) to create hyperlinks. The latest Cairo release (currently 1.7.4) provides this, although we will need to merge some of our local modifications in order to integrate it with gecko; it's not usable just as a drop-in replacement.
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This is a prerequisite to implement hyperlinks in PDF output (bug 454059), because the current version of cairo we have in the tree doesn't include the necessary APIs (`cairo_tag_begin`, `cairo_tag_end`) to create hyperlinks. The latest Cairo snapshot (currently 1.17.4) provides this, although we will need to merge some of our local modifications in order to integrate it with gecko; it's not usable just as a drop-in replacement.