IE10

This ticket is a negative reflection of IE10, not the plugin.

On focus, IE10 removes the placeholder text. Other browsers remove the placeholder text once the user types.

See here: http://stackoverflow.com/questions/14445891/keep-placeholder-on-focus-in-ie10

Is there anyway this script can be modified to prevent IE10 from misbehaving like this?

Why, oh why, can’t IE ever get it right? It infuriates me.

https://wordpress.org/plugins/html5-placeholder-polyfill/