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What is JavaScript? A Brief History JavaScript started as a simple scripting language available in browsers. When the language was first invented, writing more than a few dozen lines of JavaScript (JS) in a webpage would have been somewhat unusual. Over time, though, JS became more common and web developers used more and more JS in their webpages to create interactive experiences. Early web browsers executed JS very slowly and this sometimes led to laggy, unresponsive pages. Web browser developers saw the increased use of JS and started to optimize their browsers to run JS more quickly. Web developers responded by using JS even more to increase the interactivity of their pages. On modern websites, you might be running tens or even hundreds of thousands of lines of JS code. The web, which started as a simple network of static pages, has evolved into a platform for rich applications of all kinds.

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