How do people validate their websites in 2013? [closed]

[KinG_Ruin]

There are several options for validating websites available:

• Paste each URL into an online validator (http://validator.w3.org)
• Run a module on your web server (http://mod-tidy.sourceforge.net/)
• Run a proxy (Charles Proxy)

But none of them has the ultimate feature set:

• Intercept all requests, even subsequent to page load (HTML, CSS, JS, AJAX, JSON, XML)
• Do all processing locally without loading validator.w3c.org or similar
• Process automatically without requiring to "submit" each resource for validation
• Be actively developed (works with HTML5)

Are real people out there using any good tools to make this easier, or is validation moot until IE is eradicated?