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The given text appears to be a code snippet related to the implementation of a CSS loading technique called "relpreload." It is intended to enhance the performance and efficiency of webpages by asynchronously loading stylesheets in browsers that support the rel="preload" attribute. The code seems to contain functions designed for testing browser compatibility, determining whether relpreload is supported, enabling stylesheet loading, and handling media attributes and event listeners. Therefore, based on this information alone, it is difficult to determine the overall purpose or subject matter of the website from which this snippet was extracted.