neilgee

This plugin adds support for placeholder text in browsers that don’t support this HTML5 feature including Internet Explorer 6.
The plugin just activates the placeholders.js script by James Allardice http://jamesallardice.github.io/Placeholders.js/
There is no further configuration required.
For HTML input elements use the placeholder attribute and add a value, this value is removed when a user inputs the field. http://coolestguidesontheplanet.com/add-a-label-into-a-text-input-field-in-a-html-form/#html5
The script is 4KB and is set to load in the footer and has no library dependencies.
<h3>Usage</h3>
Just activate the plugin which loads the script, their is no further configuration.

Placeholder Text

This plugin adds support for placeholder text in browsers that don't support this HTML5 feature.

51seven

This plugin adds a placeholder field into your Gravity Forms input and displays it as a proper HTML5 placeholder attribute without JavaScript (yaay!)
I took code from <a href="http://www.wpbeginner.com/wp-tutorials/how-to-add-placeholder-text-in-gravity-forms/" rel="nofollow ugc">this article from wpbeginner.com</a> and optimized it. Applause to them.

Placehold (Gravity Forms)

Adds a placeholder field to Gravity Forms

Placeholder Text vs Placehold (Gravity Forms)