Hi,
Regarding our plugin, Bialty uses the the_content
filter, and in the case of WooCommerce, it also uses other filters for the product gallery images. Therefore, at the moment, it is not possible to add alt tags to related products, posts, the website logo, or images in the sidebar or footer, as these are outside the scope of the filters we use to add alt tags to images.
That being said, considering how our plugin works—using either the “focus keyword” or the page title as the “Alt tag” for the image, such as for a product—from an SEO perspective, using the Alt tag of a specific product (its name, in this case) as the Alt tag for other products doesn’t make sense.
This means that using the Alt tag corresponding to a product’s name (via its Meta tag keyword—aka Focus keywords, or the page title) for other products is not a good SEO practice. What matters to search engines is consistency and the reinforcement, through the Alt tag, of a page’s meaning. Diluting this understanding with a specific alt tag for different images other than the original product is not necessarily a good idea.
For example, would it be relevant if, in a Google Images search, these other products appeared for a query related to your initial product?
I hope this information helps you better understand how our plugin and Alt tags work for SEO.
Best regards.