For example, TikTok can monitor all keyboard inputs and screen taps when you open a URL using the in-app browser. Meanwhile, Instagram can even detect all text selections on websites.

JavaScript has its benefits when used correctly. Learn about JS SEO best practices and tools for JavaScript debugging here.

Do you need to perform an Ajax file upload with pure JavaScript? This example lays out the steps to accomplish an Ajax file upload without the need for a JavaScript library like jQuery or Dojo.