How Can I Display Upgrade Notices for Users with Outdated Browsers?

Display Update Request Messages for Outdated Browsers

In modern web development, ensuring compatibility with various browsers is crucial. However, older browser versions may require specific code adjustments, such as vendor prefixes. To maintain code simplicity, some developers opt for requesting browser upgrades instead of using prefixes.

To target outdated browsers and display messages urging users to update, there are multiple approaches available. One widely used method involves CSS. By utilizing the @supports rule, developers can define styles that apply to modern browsers but not to targeted browsers.

Here's an example CSS code that targets Safari 7-8, IE 10, and other browsers:

@supports (display: flex) {
  .browserupgrade {
    display: none;
  }
}

Additionally, CSS specificity rules can address specific browsers that do not support @supports:

/* IE 11 */
_:-ms-fullscreen, :root .browserupgrade {
  display: none;
}

/* Opera Mini 8 */
:-o-prefocus, .browserupgrade {
  display: none;
}

In the HTML, a dedicated div with a class of browserupgrade can be used to display the message:

<div class="browserupgrade">
  <p>You are using an outdated browser. Please <a href="http://browsehappy.com/">
    upgrade your browser</a> to improve your experience.</p>
</div>

This CSS approach effectively hides the message for users with modern browsers, while displaying it for those using targeted outdated browsers. For browsers that do not support @supports (e.g., IE

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