If I've tested my pages in most major browsers, why would I need to maintain a validated code? I want to use box-shadows and corner radius if they're supported in WebKit browsers and Firefox. I don't care if they don't show up on Internet Explorer. But I keep my HTTP requests down by not including images instead.
Are there are advantages to valid code? In SEO or otherwise?
CSS HTML Validator (previously named CSE HTML Validator) is an HTML editor and CSS editor for Windows (and Linux when used with Wine) that helps web developers create syntactically correct and accessible HTML, XHTML, and CSS documents (including HTML5 and CSS3) by locating errors, potential problems, and common ...
Valid HTML code will help assure that your site renders well across all browsers, including the version GoogleBot uses for rendering websites. For example, CSS Custom Properties is not supported by version of Chrome used by GoogleBot for page rendering (Read: Google Engineer Issues Warning About Google Crawler).
Note: Validation is important. It will ensure that your web pages are interpreted in the same way (the way you want it) by the various web browsers, search engines etc. as well as users and visitors of your Web site. Follow the link given below to validate your CSS document.
The :valid selector selects form elements with a value that validates according to the element's settings. Note: The :valid selector only works for form elements with limitations, such as input elements with min and max attributes, email fields with a legal email, or number fields with a numeric value, etc.
Because, only by knowing the rule, will you know when to break it.
Using browser-specific extensions isn't bad, but it is something you want to do on purpose, not blindly.
Validation points out the places where you deviate from the standard. Maybe you needed to, maybe you didn't, that decision is yours.
One reason for having valid HTML is for accessibility. Screen reading software for visually impaired users works much better if the HTML on the page is valid.
Invalid css/html may become horrible to maintain. Changes may have unwanted effects, which are hard to fix.
You can't test in browsers that haven't been released yet!
Browsers tend to become more standards compliant over time. If you write standards-compliant webpages, they're more likely to still work in the next version of all existing browsers.
Ask that to all the people who wrote code that worked fine when they tested it in IE 6 and then it broke when IE started supporting the standards better.
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