HTML aka Hyper Text Markup Language is a language used to create web pages. It is the most important part of a website. When the browser requests the web server to send the page, the web server will invoke the interpreter/compiler of the scripting language which in turn executes the code to generate the HTML markup. Once the HTML code is generated, the server will send the page to the user's machine.
If the page is a simple HTML page, the web server will simply send the page to the client's device.
The CrawlCenter HTML source viewer tool allows you to the HTML code of the website. To use the tool, enter the URL of the of any website in the text box you see above and click the view button. You'll now see the unmodified source code of the page. If the page is short, the tool will display it on the screen within few seconds. If it is long, wait 10 to 15 seconds.
You can use this tool to check whether the web server is working or not.