<!DOCTYPE html> <html> <head> <link rel=match href="shadow-style-invalidation-vw-units-ref.html"> <meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org"> </head> <body> <script> const iframe = document.createElement('iframe'); iframe.scrolling = 'no'; iframe.style = 'border: none; width: 50px; height: 50px; overflow: hidden'; iframe.src = `data:text/html,<!DOCTYPE html><style>head,html,body { padding: 0; margin: 0; }</style> <div style="width: 100vw; height: 50vw; background: green"></div> <div style="width: 100px; height: 100px; background: red;"><div id="host"></div></div> <script>host.attachShadow({mode: 'closed'}).innerHTML = '<style> div { width: 100vw; height: 50vw; background: green; }</style><div></div>'; host.getBoundingClientRect(); </sc` + `ript>`; iframe.onload = () => { iframe.style.width = '100px'; iframe.style.height = '100px'; } document.body.appendChild(iframe); </script> </body> </html>