Tata Consultancy Services is an Indian multinational information technology company headquartered in Mumbai, with main branches in Pune, Banglore, Hyderabad, and other cities. TCS is the largest IT company in India.


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What is TCL?

TCL is shell application that reads TCL command from its standard input or from a file and gives desired results.

TCL is string based scripting language and also a procedural language. It was first created by John Osterhout in 1989. The purpose of developing this language is easy embedded inti ( ) applications. The language is commonly used for GUIs and testing. For instance, rapid prototyping, Testing database interaction, etc. In TCL by default everything is a string.

In this tutorial, you will learn-


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Document Object Model or DOM is an essential component of web development using HTML5 and JavaScript.

This tutorial aims to cover basic concepts of HTML document structure and how to manipulate it using JavaScript.

Document Object Model or DOM

HTML DOM is not a computer science concept. It is a simple set of interfaces standardized among web developers to access and manipulate documents in HTML or XML using JavaScript. We will cover only HTML DOM in this tutorial.

These standards help developers build a webpage without worrying about implementation details. Some of the organizations involved in standardizing these interfaces are likes of Mozilla, Apple, Microsoft, Google, Adobe etc. However, it is the W3C that formalizes a standard and publishes it – see here (http://www.w3.org/DOM/).

You will need to understand the DOM if you are building any website that involves scripting using JavaScript. Understanding DOM is even more critical if you are doing any one or all of the following complicated tasks in your website –


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Before we learn more about webpagetest API, let's understand-

What is WebPagetest?

Webpagetest is one of the most popular and free tools for measuring webpage performance. Webpagetest enables you to run web performance tests on your site from a number of different locations across the world in a number of different browsers.

How to use WebPagetest API


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