What "web standards?"
The ones created by the World Wide Web Consortium – the people who invented the Web itself.
The W3C created these standards so the Web would work better for everyone. New browsers, mainly, support these standards; old browsers, mainly, don't.
What can I do?
* In addition, the lightweight Opera 9 browser offers excellent support for CSS and XHTML, though it does not as yet support the DOM. Please note that this page does not pretend to be an exhaustive list of browsers that support web standards, nor a test of browser compliance, nor a side-by-side comparison of various manufacturers' browsers.