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| 1 <!doctype html> | |
| 2 <html> | |
| 3 <head> | |
| 4 <meta name="viewport" content="user-scalable:no"> | |
| 5 <style type="text/css"> | |
| 6 body { height: 1500px; } | |
| 7 #center { | |
| 8 position: fixed; | |
| 9 left: 40%;; | |
| 10 width: 50%; | |
| 11 height: 250px; | |
| 12 top: 25%; | |
| 13 background-color: grey; | |
| 14 -webkit-transform: scale(0.25, 0.25); | |
| 15 -webkit-transition: -webkit-transform 1s; | |
| 16 } | |
| 17 | |
| 18 #drawer { | |
| 19 position: fixed; | |
| 20 top: 0; | |
| 21 left: 0; | |
| 22 height: 100%; | |
| 23 width: 120px; | |
| 24 background-color: red; | |
| 25 -webkit-transform: translate3d(-1000px, 0, 0); | |
| 26 -webkit-transition: -webkit-transform 1s; | |
| 27 } | |
| 28 | |
| 29 </style> | |
| 30 <script> | |
| 31 'use strict'; | |
| 32 window.animationDone = false; | |
| 33 function makeAnimation() { | |
| 34 var centerEl = document.querySelector('#center'); | |
| 35 centerEl.style.webkitTransform = 'scale(1.0, 1.0)'; | |
| 36 console.time('Interaction.CenterAnimation'); | |
| 37 centerEl.addEventListener('transitionend', function() { | |
| 38 console.timeEnd('Interaction.CenterAnimation'); | |
| 39 var drawerEl = document.querySelector('#drawer'); | |
| 40 drawerEl.style.webkitTransform = 'translate3D(0, 0, 0)'; | |
| 41 console.time('Interaction.DrawerAnimation'); | |
| 42 drawerEl.addEventListener('transitionend', function() { | |
| 43 console.timeEnd('Interaction.DrawerAnimation'); | |
| 44 window.animationDone = true; | |
| 45 }); | |
| 46 }); | |
| 47 } | |
| 48 </script> | |
| 49 | |
| 50 <script> | |
| 51 'use strict'; | |
| 52 var jankMs = 100; | |
| 53 var slowMs = 200; | |
| 54 window.jankScriptDone = false; | |
| 55 window.slowScriptDone = false; | |
| 56 function waitMs(ms) { | |
| 57 var startTime = window.performance.now(); | |
| 58 var currTime = startTime; | |
| 59 while (currTime - startTime < ms) { | |
| 60 var currTime = window.performance.now(); | |
| 61 } | |
| 62 } | |
| 63 function makeJank() { | |
| 64 console.time('Interaction.JankThreadJSRun'); | |
| 65 waitMs(jankMs); | |
| 66 console.timeEnd('Interaction.JankThreadJSRun'); | |
| 67 window.jankScriptDone = true; | |
| 68 } | |
| 69 function makeSlow() { | |
| 70 console.time('Interaction.SlowThreadJsRun'); | |
| 71 waitMs(slowMs); | |
| 72 console.timeEnd('Interaction.SlowThreadJsRun'); | |
| 73 window.slowScriptDone = true; | |
| 74 } | |
| 75 </script> | |
| 76 | |
| 77 </head> | |
| 78 <body> | |
| 79 <div id="center"> | |
| 80 This is something in the middle. | |
| 81 </div> | |
| 82 <div id="drawer"> | |
| 83 This is a drawer. | |
| 84 </div> | |
| 85 <button type="button" id="animating-button" onclick="makeAnimation()"> | |
| 86 Click or tap this to trigger an animation. | |
| 87 </div> | |
| 88 <button type="button" id="jank-button" onclick="makeJank()"> | |
| 89 Click or tap this to make jank of 100ms (approximately). | |
| 90 </div> | |
| 91 <button type="button" id="slow-button" onclick="makeSlow()"> | |
| 92 Click or tap this to make wait 200ms (approximately). | |
| 93 </div> | |
| 94 | |
| 95 </body> | |
| 96 </html> | |
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