Text Size : This is the size of the pure text on your site, after HTML has been removed.
Information : Charset : ASCII was the first character encoding standard (also called character set).
If there is no alt tag, search engine doesn't understand anything from the image.
That's why you should use alt tag on your all pictures, which you use in your website.
It takes a lot of time And understanding to make them logically understand while they are generally exceptionally bright.