-
-
Save HipsterZipster/218530e20053469ee0f4d015c1ddfc00 to your computer and use it in GitHub Desktop.
Preload feature detection
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
var DOMTokenListSupports = function(tokenList, token) { | |
if (!tokenList || !tokenList.supports) { | |
return; | |
} | |
try { | |
return tokenList.supports(token); | |
} catch (e) { | |
if (e instanceof TypeError) { | |
console.log("The DOMTokenList doesn't have a supported tokens list"); | |
} else { | |
console.error("That shouldn't have happened"); | |
} | |
} | |
}; | |
var linkSupportsPreload = DOMTokenListSupports(document.createElement("link").relList, "preload"); | |
if (!linkSupportsPreload) { | |
// Dynamically load the things that relied on preload. | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment