The strategy of targeting Internet Explorer with CSS hacks and using HTC files

Seeking advice on using .htc files in CSS.

If I use * to restrict non-IE browsers from applying the style to specific file types (htc, images, etc), will other browsers still load it?

I have a SASS mixin for box sizing but want to avoid loading the htc file unnecessarily.

// Box sizing
@mixin box-sizing($boxmodel) {
    -webkit-box-sizing: $boxmodel;
        -moz-box-sizing: $boxmodel;
        -ms-box-sizing: $boxmodel;
            box-sizing: $boxmodel;

    @if $boxmodel == border-box {
        *behavior: url(/js/boxsizing.htc);
    }
}

Appreciate any insights!

cssinternet-explorersasshtml-components

Answer №1

Most web browsers do not recognize the behavior as a legitimate CSS attribute, meaning that your .htc file may only be loaded by Internet Explorer.

Answer №2

Don't forget that the exclusive behavior property is meticulously analyzed and understood by IE8; this precaution is emphasized in the section on polyfill usage:

If you add a star before the behavior property as shown above [sic], it will only affect IE6 & IE7, not IE8+ (it's considered a hack), which ultimately enhances performance on these modern browsers.

If css hacks aren't your thing (or if you prioritize clean setups and optimal performance), consider utilizing IE conditional comments to integrate a separate stylesheet for IE7:

<!--[if lte IE 7]>
  <link rel="stylesheet" href="ie7.css">
<![endif]-->
<!--[if (gt IE 7)|!(IE)]><!-->
  <link rel="stylesheet" href="majestic.css">
<!--<![endif]-->

You can also create a personalized mixin for the property and generate two versions of the stylesheet:

@mixin border-box($ie7) {
  @if $ie7 {
    //disregard vendor prefixes, exclusively for IE7!
    behavior: url(/js/boxsizing.htc);
  } else {
    //remember to include vendor prefixes this time!
    box-sizing: border-box;
  }
}

Set $ie7 to true in the ie7.scss file and you're all set.

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