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Import a JavaScript library

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Import a JavaScript library. The following example imports jQuery from CDN. It loads JavaScript by creating a <script> element and adding it to the <head> element.

(Caveat) When you use a third-party library, please do it at your own risk. If you should use a malicious library, your web site would be exposed to risks to execute arbitary codes.

const script = document.createElement('script');
/* Specify the URL of a JavaScript library */
script.src = "";

/* You don't need to touch below */
return new Promise((resolve, reject) => {
  script.onerror = () => {
    reject(new Error("Failed to load script"))
  script.onload = () => {


You can use the functions of jQuery in subsequent JS steps.

// Example usage of jQuery
return $("h1").text();