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  1. lido

    Using document.write like you did is bad because fetching resources asynchronously prevents those resources from blocking the page load.

    Using a script DOM element maximizes asynchronous loading across current browsers:

    var node = document.createElement(‘link’);
    node.type = ‘text/css’;
    node.async = true;
    node.src = ‘example.css’;
    // Now insert the node into the DOM, perhaps using insertBefore()