Usually, I use a favicon PNG file for my website. It works perfectly and I can see my favicon on the browser tab.
However, when I open a PDF document in a new page from my Angular app, I notice that there is a broken icon on the browser tab. Here is how I trigger the opening of the PDF document:
<a href= "{{getRegulamentoFile()}}" target="_blank" rel="noopener" style="color: var(--wb-blue-45)"> PDF Document </a>
On the left side, you can see the broken icon: https://i.sstatic.net/lGcSWMj9.png