W3 validation of rel prettyphoto and attribute ontouchstart

Dear Support, 

We are trying to optimize our site for a SEO review, and I am getting some errors on W3 validation. 

Here is the link to my site's results: https://validator.w3.org/nu/?doc=https://virusirto.hu/

As you will see, there is 2 problems only which gives several errors. 

Unfortunately I am not able to solve these ones, so I would like to ask your help. 

As I have seen in the theme-functions.php file, you define rel prettyphoto instead of using the class element, but I don't know why, and I wouldn't like to mess up the .php file. 

Please help, it would be important for us to have a valid site for financial reasons. 

Best regards,
Andras

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