Set your coordinates to 0.5 positions instead of whole pixels and look at the differences.  Like if you draw a line from 100,100 to 200,200 try 100.5,100.5 to 200.5,200.5<p>For a quick glance, take a look at this nasty ultra-dense rendering in FF&#x2F;Chrome and compare it to IE: <a href="http:&#x2F;&#x2F;projects.voanews.com&#x2F;ebola-tracker&#x2F;" rel="nofollow">http:&#x2F;&#x2F;projects.voanews.com&#x2F;ebola-tracker&#x2F;</a> (uses raphaeljs so renders in SVG or VML, whichever is supported.)