<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,initial-scale=1"> <title>Performance Tests</title> <link rel="icon" type="image/gif" href="data:image/gif;base64,R0lGODdhAQABAIABAAAAAP///ywAAAAAAQABAAACAkQBADs="> <link rel="stylesheet" href="test-stylesheet.css"> </head> <body> <h1>Performance Tests</h1> <test-description>Testing performance with artificially demanding cases in a real browser</test-description> <test-case> <test-description><iframe> element.</test-description> <iframe src="performance-frame1.html" allowfullscreen="true" style="width: 100%; height: 200px; border: 1px solid #d8d8d8;"></iframe> </test-case> <test-case> <test-description><iframe> element containing an <iframe> element inside of an open shadow DOM.</test-description> <iframe src="performance-frame2.html" allowfullscreen="true" style="width: 100%; height: 200px; border: 1px solid #d8d8d8;"></iframe> </test-case> </body> </html>