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May 2, 2018 17:54
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Sticky element flicker demo
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <title></title> | |
| <style> | |
| .compose-box-fade-in { | |
| transition: opacity .2s linear; | |
| } | |
| .compose-box-button-wrapper { | |
| width: -moz-fit-content; | |
| width: fit-content; | |
| margin-left: auto; | |
| display: flex; | |
| justify-content: flex-end; | |
| } | |
| .compose-box-button-wrapper.compose-button-sticky { | |
| position: -webkit-sticky; | |
| position: sticky; | |
| top: 10px; | |
| z-index: 2; | |
| } | |
| .timeline-home-anchor-container, | |
| .timeline-home-page { | |
| position: relative; | |
| } | |
| main { | |
| position: relative; | |
| width: 602px; | |
| max-width: 100vw; | |
| padding: 0; | |
| box-sizing: border-box; | |
| margin: 30px auto 15px; | |
| background: #fff; | |
| border: 1px solid #dadada; | |
| border-radius: 1px; | |
| min-height: 70vh; | |
| } | |
| .container { | |
| overflow-y: auto; | |
| overflow-x: hidden; | |
| -webkit-overflow-scrolling: touch; | |
| will-change: transform; | |
| position: absolute; | |
| top: 42px; | |
| left: 0px; | |
| right: 0px; | |
| bottom: 0px; | |
| } | |
| *:focus { | |
| /* remove this and the flicker goes away */ | |
| outline: 2px solid #c5d1f6; | |
| } | |
| body { | |
| margin: 0; | |
| font-family: system-ui, -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen, Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif; | |
| font-size: 14px; | |
| line-height: 1.4; | |
| color: #333; | |
| background: #e8edfb; | |
| -webkit-tap-highlight-color: transparent; | |
| } | |
| .compose-box-button-halo { | |
| border-radius: 2px; | |
| margin: 5px 15px 15px 5px; | |
| background: rgba(255, 255, 255, 0.1); | |
| pointer-events: auto; | |
| } | |
| button { | |
| font-size: 1.2em; | |
| background: #e6e6e6; | |
| border-radius: 2px; | |
| padding: 10px 15px; | |
| border: 1px solid #a7a7a7; | |
| cursor: pointer; | |
| color: #333; | |
| } | |
| .compose-box-button { | |
| grid-area: k; | |
| justify-self: right; | |
| text-transform: uppercase; | |
| position: relative; | |
| margin: 5px; | |
| pointer-events: auto; | |
| } | |
| button.primary { | |
| border: 1px solid #132c76; | |
| background: #6081e6; | |
| color: #fff; | |
| } | |
| .timeline { | |
| height: 2000px; | |
| width: 100%; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="sapper"> | |
| <div tabindex="0" class="container"> | |
| <main> | |
| <div class="timeline-home-page" aria-busy="false"> | |
| <div class="compose-box-button-wrapper compose-button-sticky compose-box-fade-in"> | |
| <div class="compose-box-button-halo"> | |
| <button class="primary compose-box-button" aria-label="Compose"> | |
| <span>SCROLL AND WATCH ME FLICKER</span> | |
| </button> | |
| </div> | |
| </div> | |
| <div class="timeline"></div> | |
| </div> | |
| </main> | |
| </div> | |
| </div> | |
| <script> | |
| window.onload = () => document.querySelector('.container').focus() | |
| </script> | |
| </body> | |
| </html> |
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