How to add icon to opera quickbar?

Question

PHP

There is a site - https://gcore.lu/
In the opera panel, its icon does not pull up, although other sites (some) are pulled up (see screenshot). What should be added to the site?

Answer 1

HTML is fully described only by a context-free grammar, not by a regular grammar. A context-free grammar includes a regular grammar, so sometimes you can parse something, but you should not do this, relying on chance, unless you are 100% sure.
Better use something like this: https://github. com/Imangazaliev/DiDOM

Answer 2

We go under the URL - press the heart in the address bar - a carousel appears with the ability to select an icon. scroll through and choose the one that suits you best.

Answer 3

Yes, it's all right in the end!