Write the above code in a text editor and save the file with the name  helloworld2.html. Paul Irish So, we can open the “Error Console” in chrome using the following steps to view the error raised by our program: 1. Within a browser, JavaScript doesn't do anything by itself. Toggle the "javascript.enabled" preference (right-click and select "Toggle" or double-click the preference) to change the value from "false" to "true". Click on Opera icon "Menu" and than "Settings". Other features: run JavaScript (this is the most important) minor CSS rendering (text colors, Stack Exchange Network Stack Exchange network consists of 176 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to … In the "Settings" section click on the "Show advanced settings...". So you can use FireFox console which you can open by pressing Ctrl+Shift+K Or by going under Web Developer option and choosing Web Console. The part of the web browser that understands HTML and CSS is called the rendering engine. With JavaScript disabled, these dynamic interactions will not run smoothly when viewing websites. Within your browser’s developer tools there is a tab called the Console. Save the file with name  helloworld.html and open it in any browser (Chrome, Firefox, or IE). Overview. To enable JavaScript in your browser version: Internet Explorer (8.x) On the Tools menu, click Internet Options, and then click the Security tab. How to embed and execute JavaScript in HTML ? Procedure to embed and execute JavaScript in the HTML tag? Finally, if we again open the above firstProgramWithError.html file in chrome, it shows the output as below: 4. There are plenty of such platforms, but one of the most popular is called NodeJS. Now open your page that has your JS, click left mouse button and click on 'Inspect Element'. Run custom Javascript, each time you visit a website. Therefore, a user can quickly diagnose any error, if there, in the JavaScript code. In the below sections, let’s understand how does JavaScript run in a web browser and how the JavaScript engine interprets the JavaScript code. Run JavaScript File in FireFox Browser. Daniel Szymanek Polski An asterisk next to the Snippet name, which indicates unsaved code. You can use this to run small snippets of JavaScript code. Figure 9. Click "I'll be careful, I promise" if a warning message appears. Client-side JavaScript This is the most common form of the language. Programming, designing, testing, getting user feedback and writing materials for this website was done by Toni Podmanicki with help of Paul Irish & Jeremy Hill. The