In general, the steps to solve are a combination of JS plugins, conditional comments, and a test environment.
I have successfully used response.js to support media queries, you can download it from github. - Use conditional comments to avoid adding this to modern browsers.
Depending on how detailed you want CSS3 support you can configure PIE.htc - css3pie.com
Finally, to better understand the problems and results, review your browser testing options:
Setting up a virtual machine - https://modern.ie/en-us/virtualization-tools#downloads - This was a very successful method for me, and I consider it the most reliable method.
Browserstack - you can set up a trial account for 30 days; it's a good tool, but still not as reliable as a virtual machine.
codeslinger
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