tumbleweeds blow across the forum

Hm. I guess the answer to my question is "nope", then.

Yes, the "Add to > Home Screen" option from the menu works, but I'm wondering about the (not available?) feature that makes the browser display a "Add to Home Screen" banner/button automatically after a few visits to the website, as it does in Chrome.

I've implemented support for a Progressive Web App install banner on my website, which works for both Chrome on desktop (Windows) and on Android, but I have not been able to make the install banner trigger using Opera for Android (or Opera desktop browser for that matter). Some setup-info:

• Website is HTTPS enabled
• manifest.json exists, with short_name, name, 144x144 png icon, start_url
• A dummy service worker (suggested by Google for development testing) is registered on page load
• I've visited the site repeatedly over several days. No banner.

What am I missing?

Step 1) Install an extension like "Night Mode Pro" or "Dark Theme for All Websites" to reduce eyestrain

Step 2) Open a new tab, or switch to another tab, or click on a link to navigate to a new page

Step 3) Observe how your eyes are getting mutilated by the white temporary blank/empty page that flashes for a split second before rendering of the new tab/page starts.

Step 4) Get down on knees and make an emotional appeal to Opera developers to perhaps maybe do something about this, like... I don't know... allow us to modify the color of that white "transition" page, or not showing the transition page at all.

/me gets down on knees
Please?