Writing cool HTML and CSS code is not always the easiest thing to do, specially if you need to get it working on older browsers.
Modern.ie is Microsofts effort to make this easier for you. Modern.ie is a dev center with free (yes free) tools and resources to spend more time building your web applications instead of testing it on older browsers.
- Download virtual machines
- Scan a webpage for common coding issues
- Test BrowserStack for 3 months.
Read more on modern.ie