UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36

Steps to reproduce the problem:
1. Upload file (using the browse button provided by input type=file.
2. Don't actually upload the file. Leave it as it is in the browser.
3. Read .files on that element. You can see the file size. (Or use a new FileReader to read the file's data.)
4. Update the file on the client machine (outside of the browser.)
5. Read .files on the element (or use a file reader.) The data is updated. 

What is the expected behavior?
I would not expect that the file uploaded has the same data as when it is changed on the user's disk. 

What went wrong?
Originally I thought this could be a nice feature for an app that I am writing but I found that Internet Explorer and Firefox had different behaviors. Only Chrome actually allowed the updated text to be read again without a re-upload. 

Did this work before? N/A 

Chrome version: 59.0.3071.115  Channel: stable
OS Version: 10.0
Flash Version: 

Is this intended behavior or is it a potential security bug?
 

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