** End of Support ** This plugin adds native HTML5 placeholder support to Gravity Forms' fields with javascript fallback.

Noted That:

To install correctly this gravityforms-html5-placeholders.zip.
Fisrt Download the gravityforms-html5-placeholders.zip to your computer
Extract/Open gravityforms-html5-placeholders.zip to Your Computer.
Then, Find readme.txt file inside gravityforms-html5-placeholders.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "gravityforms-html5-placeholders.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "gravityforms-html5-placeholders.zip" Downloaded plugin from your computer, Where you downloaded gravityforms-html5-placeholders.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Gravity Forms HTML5 Placeholders" folder is added on left sidemenu. Now, Click on "Gravity Forms HTML5 Placeholders" folder.

Noted that: If you do not see "Gravity Forms HTML5 Placeholders" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Gravity Forms HTML5 Placeholders Configurtions and Settings or How to work "Gravity Forms HTML5 Placeholders" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "Gravity Forms HTML5 Placeholders" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Gravity Forms HTML5 Placeholders
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
Download the gravityforms-html5-placeholders.zip file to your local machine. Either use the automatic plugin installer (Plugins – Add New) or Unzip the file and upload the gravityforms-html5-placeholders folder to your /wp-content/plugins/ directory. Activate the plugin through the Plugins menu Visit the Gravity Forms general settings page ( Forms -> Settings ) and make sure that Output HTML5 option is set to yes. Visit the Gravity Forms form editor and add html5 placeholders to your fields.

Guide

Download the gravityforms-html5-placeholders.zip file to your local machine.
Either use the automatic plugin installer (Plugins – Add New) or Unzip the file and upload the gravityforms-html5-placeholders folder to your /wp-content/plugins/ directory.
Activate the plugin through the Plugins menu
Visit the Gravity Forms general settings page ( Forms -> Settings ) and make sure that Output HTML5 option is set to yes.
Visit the Gravity Forms form editor and add html5 placeholders to your fields.

support, forms, fields, javascript, fallback, gravity, placeholder, plugin, adds, native,

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Reffered: https://wordpress.org/