That is, it will check that it complies with the CSS standards set by the W3 Consortium.
There are a few which will also tell you which CSS features are supported by which browsers (since not all browsers are equal in their CSS implementation).
Hosting your own server gives you full control over your game and game modes, so you can play the exact flavor of CS: GO you want.
This guide contains instructions on how to download the dedicated server and launch the game server. You may wish to consult the following resources for additional information on this topic.
This is because the input is optional, so leaving it blank would result in a valid form submission.
To fix this behaviour, the second was introduced in CSS Selectors Module 3, which means old versions of browsers do not support it. If you require older browser support, either polyfill, or use these selectors in non-critical ways á la progressive enhancement, which is recommended.
Game servers traditionally are not easy to manage yourself.An update on the Update The reason for the recent update was to move Counter-Strike Source (CSS) from the older HL2 version of the Source engine to the most recent version.This brings the CSS codebase in-line with our other games.In particular, an HTML validator checks to make sure the HTML code on your web page complies with the standards set by the W3 Consortium, the organisation ("organization" in US English) that issues the HTML standards.There are various types of HTML validators: some only check for errors, while others also make suggestions about your code, telling you when it might lead to (say) unexpected results.