As a simple example though, assume you wanted to make a Shadow DOM widget to show a visual representation of an audio sample, or any other kind of detailed graph. Something you arguably don't want to build a giant SVG tree for. Those seem like great things to do with shadow dom widgets... but ... they seem S.O.L without a per element resize event.
I suppose that's being a little over the top. As long as you make them a fixed size or manually call some 'redraw' function when your app notices they've been resized then you're fine. It's just part of the point of Shadow DOM is you're not suppose to have to do that. They should "just work" just like normal HTML elements and size and redraw themselves. It would be nice if there was a way to do that for more interesting canvas based widgets.
I suppose that's being a little over the top. As long as you make them a fixed size or manually call some 'redraw' function when your app notices they've been resized then you're fine. It's just part of the point of Shadow DOM is you're not suppose to have to do that. They should "just work" just like normal HTML elements and size and redraw themselves. It would be nice if there was a way to do that for more interesting canvas based widgets.