fix tab navigation for external links
fix tab navigation for external links

This code is duplicate of lines 552 to 557 without allowing external links.
sbrieuc/material-design-lite,rrenwick/material-design-lite,anton-kachurin/material-components-web,Kekanto/material-design-lite,pgbross/material-components-web,rrenwick/material-design-lite,2947721120/material-design-lite,tradeserve/material-design-lite,dgrubelic/material-design-lite,Kekanto/material-design-lite,google/material-design-lite,iamrudra/material-design-lite,anton-kachurin/material-components-web,google/material-design-lite,material-components/material-components-web,tradeserve/material-design-lite,material-components/material-components-web,2947721120/material-design-lite,Yizhachok/material-components-web,i9-Technologies/material-design-lite,material-components/material-components-web,Yizhachok/material-components-web,mattbutlar/mattbutlar.github.io,sbrieuc/material-design-lite,pgbross/material-components-web,iamrudra/material-design-lite,dgrubelic/material-design-lite,i9-Technologies/material-design-lite