Differences Between JavaScript & HTML

Hypertext markup language (HTML) is a language used to create Web pages. The HTML language is interpreted by the Web browser, and it delivers the images and text for the user. JavaScript is a more advanced language to make Web pages dynamic. Both these languages have differences, but they are used in unison to present websites.

Website programming includes HTML and JavaScript languages.

Dynamic Programming

The hypertext markup programmed for a Web page is static. This means the code is displayed on the browser, and it cannot change or interact with the user's input. However, incorporating JavaScript makes a Web page dynamic. With JavaScript, a programmer can change the values and properties of an HTML tag as the user clicks a button or chooses a value from a drop-down box. JavaScript is included with the HTML code on a Web page, so it works in conjunction with the code.

Client-Side vs. Server-Side

HTML is rendered from the server. This means that any code programmed on the Web page is processed by the server before it is sent to the user. The static code created in the HTML pages are hosted on the website's domain, and the HTML rendered can be created using dynamic programming languages such as C#, PHP or VB.NET. JavaScript is completely run on the client machine, so any code created is compiled and executed on the Web browser. For this reason, JavaScript is not a secure language and passwords and user names should not be processed using the JavaScript language.


With several browsers on the market, compatibility is an issue for any Web application. However, HTML is consistently supported by all browsers, and the main tags used for a Web page are rendered without an issue. JavaScript functions are not always compatible across browsers. Some JavaScript functions work well in Internet Explorer, but they may not execute properly in Firefox or Chrome. For this reason, some companies are forced to list a compatibility browser for the Web application to ensure users are able to view the website properly.