14. A non-transitory machine-readable medium storing a browser-based application received from a server through a network for spell checking a document on a client device, the browser-based application executable by at least one processing unit, the browser-based application comprising sets of instructions for: receiving, on the client device, a data structure for a dictionary comprising a list of correctly spelled words from the server, the data structure utilized to prune the number of searches of the dictionary to match a word to strings associated with valid words in the dictionary, wherein the data structure is independent of the browser-based application and is received from the server in a data file separate from the browser-based application; and determining a word as having a correct spelling when the word matches a string associated with a valid word in the data structure for the dictionary.
14. A non-transitory machine-readable medium storing a browser-based application received from a server through a network for spell checking a document on a client device, the browser-based application executable by at least one processing unit, the browser-based application comprising sets of instructions for: receiving, on the client device, a data structure for a dictionary comprising a list of correctly spelled words from the server, the data structure utilized to prune the number of searches of the dictionary to match a word to strings associated with valid words in the dictionary, wherein the data structure is independent of the browser-based application and is received from the server in a data file separate from the browser-based application; and determining a word as having a correct spelling when the word matches a string associated with a valid word in the data structure for the dictionary. 19. The non-transitory machine-readable medium of claim 14 , wherein the browser-based application is activated by a browser on the client device, the client device having a plurality of browsers, the browser-based application further comprising a set of instructions for providing a set of suggestions for one or more words determined as having no correct spelling, wherein spell checking and providing suggestion for each word provides a same set of results regardless of the browser used to activate the browser-based application.