Placeholder "fixed" element, should not overlap tabs when page first loads.
Deep linking will auto-scroll to your selected tab. If there is a "fixed" element on the page, it may overlap your tabs. To fix this, use scrollOffsetSelector to select the "fixed" element. That will offset the scroll position by the "fixed" element's height. Use scrollOffset for any additional adjstments. See a demo: ?selected-tab=tab-3.
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