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Run JavaScript After the DOM Content Has Loaded

This allows a vanilla JS implementation of jQuery's $( document ).ready().

Referencing the mdn web docs_ article on DOMContentLoaded.

const myFunction = () => {};

if (document.readyState === 'loading') {
    // Loading hasn't finished yet, set an event listener
    document.addEventListener( 'DOMContentLoaded', myFunction );
} else {
    // `DOMContentLoaded` has already fired, run the func directly


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