.tab-underline:after{content:"";view-transition-name:tab-underline;background:#000;height:2px;position:absolute;bottom:-1px;left:0;right:0}::view-transition-old(tab-underline){animation-duration:.25s;animation-timing-function:cubic-bezier(.4,0,.2,1)}::view-transition-new(tab-underline){animation-duration:.25s;animation-timing-function:cubic-bezier(.4,0,.2,1)}