SUMMARY
When using the "Read-Only" attribute in an input text box, the AutoComplete feature allows the user to change the supposedly fixed value. Here's an example:
INPUT readonly type="text" name="locked" value="eg"
In the above case, if the user has the AutoComplete feature turned on and there happens to be a string mapped to the name
locked that was a subset of the word "eg" then the user could change the value as the AutoComplete drop-down box appears.