Works in 90% percents of cases, don't know why (will add an example later)
Quiet flexible: use any attribute of a DOM element to set "value" attribute.

Here is an example:
I'm trying to apply for a job on a game development studio website:
http://crytek.com/career/offers/overview/frankfurt/art-animation/junior-ui-artist

The form and DOM elements look like that:
https://monosnap.com/file/0jW46DvODCLTtKMeTNUGB2iUtqErWl

As you can see all the fields was filled successfully, except the "website".
Here is the selection row for such field:
input[name*='web'], input[name*='url'], input[name*='work'], input[name*='link'], input[name*='Portfolio'], input[name*='portfolio'], input[name*='Url'], input[name*='site']

Looks like "site" and and "link" should solve the problem. But it doesn't work at this particular form.