Test expects input elements having name='id', name='name', and name='target'. Additionally, these should have id='id', id='name', and id='target' respectively. No element was provided with id='id' or name='id', but rather one element had two name attributes (illegal) with the values 'id' and 'name' respectively.

Fixes #12518, removes an offsetWidth on focus/blur events for an <IE9 bug that caused a performance hit. Closes gh-958

We only care about the result of parseJSON so there's no reason to feature detect the entire test.

adds strict rule to jshint options (except for test files). "use strict" is added to the main jQuery closure and some "could-be-unsafe" `this` trickery in effects is silenced.

Fixes #12752: Added OS-switch for grunt task "custom", to make use of grunt.cmd on Windows operating systems. closes gh-996