should help you out HTML is the HyperText Markup Language, which is designed to create structured documents and provide for semantic meaning behind the documents. HTML5 is the next version of the HTML specification. XML is the Extensible Markup Language, which provides rules for creating, structuring, and encoding documents. You often see XML being used to store data and to allow for communication between applications. It's programming language-agnostic - all of the major programming languages provide mechanisms for reading and writing XML documents, either as part of the core or in external libraries.
How to compare content of two html5-canvas-elements?
I wish did fix the issue. The extension of a filename you seen in a url has absolutely NOTHING with how that file will be treated by a browser when it's downloaded. It all comes down to the Content-type header that accompanies the file. A webmaster can trivially configure their server to treat all .exe files as plain HTML pages. They can also tell the webserver to run .html pages through the PHP parser. In fact, with "modern" SEO-optimized urls, you rarely see a file extension at all. It'll all be things like example.com/some/wonky/path, not example.com/page.php?id=wonky. The fact that PHP has built and output a page also has nothing to do with HTML compliance. It comes down to whether the page the browser receives conforms to the standards. Are all tags properly closed? Attributes properly defined? Tags properly nested? Blah blah blah.
var startDt = document.getElementById("startDate").value;
var endDt = document.getElementById("endDate").value;
if( (new Date(startDt).getTime() < new Date(endDt).getTime()))
// Your code here