Use the placeholder attribute instead of faking it with value.

[Mikk3lRo]

Summary

I'm guessing the reason Chosen sets the value of the search-input in multi-selects instead of using the placeholder attribute is for historical / compatibility reasons... but:

1. Chosen clears the placeholder as soon as the search field receives focus, while other inputs keep the placeholder visible until the user starts typing. Of course this is impossible (or at least very unpractical) when using the value as placeholder. Using a "real" placeholder provides a more consistent UX.
2. All modern browsers have supported the placeholder attribute on text inputs for at least 5 years now... it should be safe to switch.

• All changes were made in CoffeeScript files, not JavaScript files.
• You used Grunt to build the JavaScript files and tested them locally.
• You've updated both the jQuery and Prototype versions.
• You haven't manually updated the version number in package.json.
• If necessary, you've updated the documentation.