[BAReF00t]

TL;DR: He didn't!

He wrote a UI for a browser engine (Webkit, of couuurse). Using a UI toolkit (Qt). In a scripting language.

Which is more putting wallpaper on the walls than constructing the building or even painting the walls.

[BubRoss]

I don't know who would downvote this. There are lots of articles about someone creating their own browser and they all turn out to be a variation of 'they didn't create their own browser, they made their own skin'.

[detaro]

Many different browsers use the same engine at the core. That doesn't mean they aren't different pieces of software. just that they use the same engine.

(In this case, one might nitpick that "programmed" suggests something different, but I don't think that's clear cut)

[BubRoss]

At some point surely there is a line when the whole headline is 'this is bad, I made my own'. That would be like me saying 'modern OSs are bad, I made my own' and it actually being a new task bar for a Linux distribution.

At some point people need to take responsibility for the titles they write.

[detaro]

Sure, but it's IMHO clearly arguable where that line is. The underlying engine is only a part of the user experience of a browser, and browser based on a common engine are commonly described as different products.

Chrome, Chromium, new Edge, Brave and Qutebrowser all use the same engine, but even the first two are not uncommonly considered to be different products. Same with Safari, Chrome and Firefox on iOS, despite Apple only allowing their own browser engine on iOS.