Out of curiosity, I used the Google Chrome option to view the Google source code, and there I found a meta tag with a itemprop="image" attribute.
So:
<meta
content="/images/branding/googleg/1x/googleg_standard_color_128dp.png"
itemprop="image" />
Does anyone know what this is for? I've never read anything about it.
This is about the schema.org site to treat microdata, Rich Snippets .
ImageObject
schema.org > Thing > CreativeWork > MediaObject > ImageObject
An image file.
Usage: Over 1,000,000 domains
This example of itemprop="image" is at this link above.
It is for the SEO of the website. It improves, a lot, if you know how to use it. I use it for products, services, social networks and images.
On the Google Developers website, you have a test to see if Google finds your structured data: Structured Data Testing Tool .