Here you can find the full list of browsers that support XMLHttpRequest Level 2:
http://caniuse.com/#feat=xhr2
According to the site, about 62% of browsers support it, including:
- Firefox 4+
- Chrome 7+
- Safari 5+
IE8 / 9 supports the XDomainRequest object, but will support XmlHttpRequest Level 2 with IE10.
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