Errors are produced by the Less mixin in Internet Explorer 8

I'm encountering an error on Internet Explorer 8 when I use this mixin:

SyntaxError: Object doesn't support property or method 'map'

>>less<<

    body{.gradient; 
}

>>mixin<<

.gradient(@color: #F5F5F5, @start: #EEE, @stop: #FFF) {
  background: @color;
  background: -webkit-gradient(linear,
                               left bottom,
                               left top,
                               color-stop(0, @start),
                               color-stop(1, @stop));
  background: -ms-linear-gradient(bottom,
                                  @start,
                                  @stop);
  background: -moz-linear-gradient(center bottom,
                                   @start 0%,
                                   @stop 100%);
  background: -o-linear-gradient(@stop,
                                 @start);
  filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",@stop,@start));
}

Could someone help me understand why IE8 is giving me this error message? Thank you.

Answer №1

It appears that your website is utilizing less.js, which relies on ES5 browser support. (map() belongs to Array.prototype and was introduced in ES5).

Unfortunately, IE8 lacks ES5 support, but by including es5-shim before loading less.js, you can resolve this issue.

Answer №2

map() is a method found in the Array object, however it is only compatible with newer browsers. This is why LESS relies on it and consequently fails to function properly in IE8.

Although it is possible to polyfill Array.map(), it may not be advisable in this situation since there are likely other modern JavaScript features used by LESS that would also cause issues in IE8.

Ultimately, these discussions are somewhat irrelevant. Utilizing LESS in the browser can greatly impact site performance: the site will not render correctly until after all JS code has loaded and the LESS parser has executed.

For optimal performance, it would be wise to compile your LESS code into CSS on the server side and serve only the compiled CSS to the browser. This approach should be prioritized before considering whether or not LESS is supported in different browsers.

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