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Forked from yoavweiss/preload_feature_detection.js
Created February 28, 2017 05:33
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Preload feature detection
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.
}
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