That demo page told me everything I needed to know about not using that framework. There's no right-click to copy the text, and there's similarly no context menu to open links in a new tab, or copy their URL
And just like that, we're back to the old days of Macromedia Flash where you have to write your own context menu and specify which texts are selectable.
Yeah, I knew I was in for some onoz when I saw "compiled to WebAssembly and rendered with WebGL". In their defense, it's stunning that any text operations work at all
Also, "There is no DOM, HTML, JS or CSS" is some uh-huh given the considerable amount of silliness involved in view-source:https://www.egui.rs/