Everything you've always wanted to know about site migrations but were afraid to ask! Moz have got an extensive article covering everything you'd need to consider when migrating a site, which could include:

  • switching to https
  • domain name change
  • URL changes
  • site structure changes
  • changing CMS
  • making a site mobile-friendly
  • a site redesign

With plenty of tips and tricks, it's worth a read if you're planning any major changes to your site.

A Theme Switcher: now this looks like the perfect way to create a high contrast version of your site:

filter: invert(100%)

Unfortunately the filter property isn't widely supported yet, and there are a few caveats that need addressed, but it looks like a really lightweight method.