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I modified the Writing to a file example such that I can store some text from an input. I am storing the text aaaaaaaaaa to the file and afterwards the shorter bbbbb to the same file with the same function.

Additionally I am using the Reading a file by name example to read the file. I am getting -- with Chromium 15 -- this result:

bbbbbaaaaa

How can I reset the content of a file? The spec just offers getBlob() and append().

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Reset to default
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There's a "truncate" method on the FileWriter interface. (It works more like a "setFileSize" method, in that it's possible to "truncate" a file to a larger size than it already has.)

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truncate did it. It took me half an hour not to run in an INVALID_STATE_ERR.
Yes it seems like it can't be called except immediately after opening the file, or something like that; the spec is not super clear.
Have a look on github.com/vitalets/bro-fs where fs.writeFile() truncates file automatically.
@vitalets that looks interesting, but it's for Node, and it's not clear whether this question was about server- or client-side work (though from 2011 it's more likely to be client-side). It's kind-of moot anyway since the HTML5 FileSystem API is defunct.
Nope. It's for browser, but with Node.js compatible API.
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