I have been assigned the task of validating a website.I searched the web and found this post of w3schools that allows validating the HTML, CSS, XHTML, XML, WML of a website.The only real way to find out, is to ask people to test it on their device.Summary: Evaluating sources of information is an important step in any research activity.Having a W3 valid structure/mark up doesn't mean, your website will look the same on every browser.There exist a lot of tools and plugins to emulate different resolutions or mobile device, but these often don't do a good job.
There are also validator add-ons for Firefox and Chrome.
In short, you have to sift and make decisions all the time, and you want to make responsible choices that you won't regret. It's been called an art as well as work—much of which is detective work.
You have to decide where to look, what clues to search for, and what to accept. Learning how to evaluate effectively is a skill you need both for your course papers and for your life.
However, in this case you can create client-side code that performs essentially the same check that your server-side code is performing.
In the final part of the walkthrough, you will add some optional information to the reservation form.