Importing an html pic file into PS Elements

Do you mean a WebP image?

If so, there's a plugin you can download which enable you to open and save WebP images in Photoshop Elements 2021.

Follow the instructions here: WebPShop 

Just substitute C:\Program Files\Adobe\Adobe Photoshop\Plug-ins for C:\Program Files\Adobe\Photoshop Elements 2021\Plug-Ins if you're a Windows 10 user. If you're on a Mac, I'm sure you'll work it out 🙂

All other common web image file formats as supported by Photoshop Elements 2021 straight out of the box, e.g. JPEG, PNG and GIF. 

Moved to the Photoshop Elements forum, from the Photoshop forum.