Cache edit box contents in browser

[elapse2039]

Not sure if this can be done in browser easily but the use case Im encountering is as follows...

Editing a post, trying to save often, but occasionally wifi/connection timesout and browser has retry error.

The changes have been lost at this point.

It would be great if the currently unsaved edits were saved locally and could resume on a browser reload of the post edit page. (Not periodic server saves like you see in other web apps).

This happened quite often while creating posts on the go where there was at times unpredictable connectivity and infrequent but long timeouts.