Today Microsoft detailed the spell check feature in upcoming version of Internet Explorer that will come with Windows 8. It will feature both auto correction and spelling suggestions on any text box within the browser.
IE10 has the first browser-based implementation of auto-correct.
In some cases, a misspelled word is so common that it is better to just correct the word immediately, rather than wait for you to review the error later In the rare case that auto-correct changes something that you didn’t want changed, you can undo the change via CTRL+Z (Undo) using the keyboard, or bring up the auto-correction context menu using the mouse. In addition to using the mouse, the auto-correction menu can be activated via the keyboard by moving the insertion point inside of the word and pressing SHIFT+F10 (that key combo works to trigger any context menu). From the auto-correction menu you can also prevent the word from being auto-corrected in the future.
The same goes for the Metro version of the IE in Windows 8. In both the versions, the users can select their own language of their choice for suggestions.
More at IE Blog.