CSS Media Queries not working in Firefox and Chrome


One of my clients has a site with a responsive design (three based on ranges) with so many graphics they do have to reduce them for each range. We don't detect by device or anything silly though I do need to define with CSS profiles that I can later read with JavaScript as there are things we have to go out of our way and style with both JavaScript/CSS though because the background-image moves based on the "profile" the calculations have to be based off of which media query is in effect.

Unfortunately both Firefox and Chrome are acting a bit wonky when it comes to which profile is "active". The client considers 640 pixels or less to be a "phone" device, 641 ~ 991 a "tablet" device and 992 pixels and greater to be a "desktop" device. I've managed to improve a few things though I haven't figured out why "tablet" isn't working on Firefox and why both "phone" and "tablet" don't work on Chrome?

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> <title>Device Profiles</title> <style type="text/css"> @media (min-width: 0) and (max-width: 640px) { h1::before {content: 'Phone ';} } @media (min-width: 641px) and (min-width: 991px) { h1::before {content: 'Tablet ';} } @media (min-width: 992px) { h1::before {content: 'Desktop ';} } </style> </head> <body>


</body> </html>


Your media queries are working fine for me in both Chrome and Firefox, the only issue is the tablet breakpoint because you put min-width twice instead of max-width. Just change it to:

@media (min-width: 641px) and (max-width: 991px) { h1::before {content: 'Tablet ';} }

<a href="https://jsfiddle.net/tr8f9Lf4/" rel="nofollow">JSFiddle</a>


Your mistake is using two min-widths accidentally. Please try this.

@media (min-width: 0) and (max-width: 640px) { h1::before {content: 'Phone ';} } @media (min-width: 641px) and (max-width: 991px) { h1::before {content: 'Tablet ';} } @media (min-width: 992px) { h1::before {content: 'Desktop ';} }


<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> <title>Device Profiles</title> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <style type="text/css"> @media (min-width: 0) and (max-width: 640px) { h1::before {content: 'Phone ';} } @media (min-width: 641px) and (max-width: 991px) { h1::before {content: 'Tablet ';} } @media (min-width: 992px) { h1::before {content: 'Desktop ';} } </style> </head> <body>


</body> </html>


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