IE's

IE's market share, while still the highest, has shrunk dramatically and the browser market is more balanced.

Technology columnist Walt Mossberg answers readers' questions. 2012

So, the President is out there saying that the post-Citizens United IE's are "politics at its worst," and that the decision "gave special interests the power to spend without limit -- and without public disclosure -- to run ads in order to influence elections."

Jane Hamsher: Soros, Lewis and Other Big Donors Abandon Democrats for Progressives and Weed Jane Hamsher 2010

IE's market share dropped 62.7 percent to 46.9 percent, while Google Chrome's share more than tripled from 4.6 percent to 14.9 percent.

The State Of The Internet In 2010: More Spam, Sites, Users The Huffington Post 2011

According to analytics company StatCounter, Firefox had 38.1% of the European market in December, compared with IE's 37.5%.

CES Notebook | Highlights From the Show and Digits Blog 2011

So, the President is out there saying that the post-Citizens United IE's are "politics at its worst," and that the decision "gave special interests the power to spend without limit -- and without public disclosure -- to run ads in order to influence elections."

Jane Hamsher: Soros, Lewis and Other Big Donors Abandon Democrats for Progressives and Weed Jane Hamsher 2010

The javascript engine is the other difference worthy of concern, but as long as your JS is W3C compliant (with appropriate workarounds for any of IE's non-standards-compliant javascript implementations) you can be pretty confident that it will work fine in Chrome.

Chromium Releases Official Mac, Linux Browser Alphas | Lifehacker Australia 2009

Santiago Iñiguez de Onzoño , IE's dean, says the global approach, along with strong entrepreneurial interests and career goals of its students, has helped shield the school from Spain's economic woes.

IE's Entrepreneurial Focus Shields It From a Shakeout Melissa Korn 2011

Net Applications 'widely-cited statistics, based on data collected at tens of thousands of clients' sites, now show IE's share of the browser market dropping to 59.95 percent.

Internet Explorer market share keeps eroding as Chrome's grows 2010

For example, the tech-news site Ars Technica reports that more than 40 percent of readers use Firefox, with IE's 19.39 percent barely beating Safari and Chrome.

Internet Explorer market share keeps eroding as Chrome's grows 2010

IE's gains in June were larger in Europe and Asia than they were in the United States.

Microsoft IE gains browser market share (this is not a typo) 2010