Font rendering
 
I have noticed inconsistencies with font rendering in both Chrome and Firefox. Although the difference is very subtle this can cause alignment issues in certain use cases.
 
Chrome
Firefox
 
A suitable fix for this would be the following:
 
html {
   text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}