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1. HyperTextAccessibleBase::CharBounds didn't have code to support magic offsets (like TEXT_OFFSET_CARET) at all, resulting in a crash. 2. HyperTextAccessibleBase::TextBounds handled the end offset being a magic offset, but not the start offset. 3. HyperTextAccessible::CharBounds assumed it could just add 1 to the start offset to pass to TextBounds, which resulted in returning the rect from the caret to the end of the container, since length (-1) is caret (-2) + 1. This patch addresses all three of these issues. Differential Revision: https://phabricator.services.mozilla.com/D171545