Automated Site Wide HTML Markup Validation Tool: SimplyTestable

SimplyTestable is an online markup validation services that saves your time and allows you validate the HTML markup for your entire site in one click.  It takes the pain out of routine front-end web testing.

The service currently validates the HTML markup for the entire site (more features coming soon)

• Site-wide HTML markup validation in one click
• Overview report of your entire site’s successes and failures
• Detailed per-URL error report