Find the full document at http://www.html5rocks.com/en/tutorials/file/dndfiles/
In each example you can also drag files to the 'choose' button and drop them.
File Info
Select files and see the 'name', 'filetype', 'filesize' and 'last modified'
Select Image files
Select some image file and they will be displayed as thumbnails
Select a text file and slice it up
Select a text file and then choose the slice you want to view
Read bytes: