How Can I Use CSS to Prompt Browser Upgrades for Non-Prefixed Flexbox Support?

Upgrade Browser Directive: CSS Approach for Non-Prefixed Flexbox Browsers

When redesigning websites using CSS flexbox, browser compatibility becomes crucial. Flexbox support is widespread among modern browsers, with exceptions being Safari 8, IE 10, and a handful of less common ones.

Instead of using vendor prefixes for these specific browsers, some web developers prefer to encourage visitors to upgrade their browsers for a more optimal user experience. The question arises, however, as to how to effectively target these outdated browsers and display a message urging users to upgrade.

One solution is through CSS alone. By utilizing the @supports rule, we can target browsers that do not support prefixed flexbox syntax. For browsers such as IE 11 and Opera Mini 8 that support non-prefixed flexbox but not @supports, additional CSS rules are required.

The following CSS snippet covers the majority of targeted browsers, with only IE 7 and earlier being excluded:

.browserupgrade { display: block; }
_:-ms-fullscreen, :root .browserupgrade { display: none; }
:-o-prefocus, .browserupgrade { display: none; }
@supports (display: flex) { .browserupgrade { display: none; }}

To display the upgrade message in HTML, simply create a <div> with the class "browserupgrade" and populate it with the desired content:

<div>

This approach ensures that the upgrade message is only visible to visitors using non-prefixed flexbox browsers, encouraging them to upgrade for a smoother website experience.

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