Width detection via sneaky CSS rules
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| <!DOCTYPE html> | |
| <!--[if IE 8]> <html lang="sv-SE" class="no-js ie8"> <![endif]--> | |
| <!--[if gt IE 8]><!--> <html lang="sv-SE" class="no-js"> <!--<![endif]--> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Breakpoint detection test</title> | |
| <style type="text/css" media="screen"> | |
| @media screen and (min-width: 320px) { | |
| #page:after { | |
| content: 'smallest'; /* represent the current width-bracket */ | |
| display: none; /* hide ALL THE THINGS */ | |
| } | |
| } | |
| @media screen and (min-width: 480px) { | |
| #page:after { | |
| content: 'small'; /* represent the current width-bracket */ | |
| } | |
| } | |
| @media screen and (min-width: 600px) { | |
| #page:after { | |
| content: 'large'; /* represent the current width-bracket */ | |
| } | |
| } | |
| @media screen and (min-width: 768px) { | |
| #page:after { | |
| content: 'largest'; /* represent the current width-bracket */ | |
| } | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="page"> | |
| <h1>Reload at different viewport widths to trigger script.</h1> | |
| </div> | |
| <script type="text/javascript" charset="utf-8"> | |
| (function(win){ | |
| var doc=win.document, | |
| el, | |
| pseudo; | |
| if (win.getComputedStyle && doc.querySelector) { | |
| el = doc.querySelector('#page'); | |
| pseudo = win.getComputedStyle(el, ':after').getPropertyValue('content'); | |
| if (pseudo) { | |
| alert(pseudo); | |
| } | |
| } | |
| })(this); | |
| </script> | |
| </body> | |
| </html> |
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This is really neat. I landed here from Jeremy Keith's Conditional CSS, but it looks like my latest version of Chrome ignores
getComputedStyle(el, ':after').getPropertyValue('content');when the display is none. It looks like it's a Chrome bug? https://code.google.com/p/chromium/issues/detail?id=236603