Why Does Adding \'?#iefix\' to EOT URLs Fix Web Font Loading in IE6-IE8?

The '?#iefix' Solution for Web Font Loading in IE6-IE8

Many resources online, such as the one at fontspring.com, recommend adding a '?#iefix' to the EOT URL to address web font loading issues in IE6-IE8. Understanding how this solution works is crucial.

Understanding the Problem

IE6-IE8 have a parser bug in their src attribute for the font-face rule. When multiple font formats are specified in the src attribute, IE fails to load the fonts correctly, resulting in a 404 error.

The '?#iefix' Solution

The '?#iefix' addition tricks IE into interpreting the rest of the URL as a query string. This fools IE into thinking that only the EOT file is included.

Other modern browsers, such as Chrome, Firefox, and Edge, follow the specified syntax and load only the required font type.

Conclusion

By adding a '?#iefix' to the EOT URL, the src attribute becomes compliant with IE6-IE8's buggy parser. This ensures that older versions of IE can still load and display web fonts correctly.

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