> Also, this ability to hook onto the DOM and play with things in the console disappears with packaged electron apps, which turn-out to be often less "introspectable" in practice than their native counterparts.

To be clear, Electron is NOT what I am asking for. Electron is not fulfilling the spirit of having native DOM. I don't care what it's authored in, I care about what I can do with it as a user. Electron is in some cases a step backwards because I lose even the very limited styling options that the OS does provide.

It's not about what the developer writes, it's about what I as the user am presented with. The major strength of the DOM is that you have to describe your interface using text to the user, not to the compiler.

> Web implies DOM, but CSS/XML doesn't, and defining documents and UIs in a SGML is much older than HTML itself.

But this gets back to your original premise: the DOM was never designed to hold rich applications, and yet, it turns out that XML is perfectly fine for authoring rich applications. The whole document/application distinction hasn't held up (and arguably never held up), which is evidenced by basically every one of these toolkits pushing in that direction. I'm not sure how people can say that the DOM/CSS is insufficient for this when native toolkits are literally pulling CSS in now.

But again, I don't really care about HTML/CSS in specific. I care about the architecture. If the problem is just what specific components HTML provides, then use something else. But I want there to be something universal that (almost) everything on my OS uses. I want to get some broad agreement from application devs that they're not going to push pixels to the screen, they're going to give me as an end user a live interface in a shared XML format.

And I want to be really clear again, defining documents in UIs and SGML is not what I care about. I care about what gets presented to the user. The authorship is not the important part here.

I want to be able to open my calendar app's interface in a text editor.

You mention the browser's dev tools yourself, and it's a really good question that I think kind of demonstrates my point:

> Which is totally different than web browser's DOM appearing under "developer tools", or is it?

To be completely honest, yeah, I do think it's totally different. I can do things as a user in the browser dev tools that I can't do for any of these native toolkits: insert additional markup, add my own rules and event listeners and scripts, etc. And importantly, I can do that stuff on every single website, not using a specialized debugger for a small portion of the apps on my computer. I regularly open my dev tools and write little helper scripts for websites. I regularly alter CSS on the fly for websites I visit.

And sure, I don't actually think that browsers are doing a great job of leveraging this, I think they could go way further and could support even more powerful use cases. And some of the integration between the DOM and JS and the tendency towards div soup is actually quite bad on the web. But even so, the experience of working with the dev tools as an end user consuming somebody else's web app interface is miles ahead of the functionality on native platforms. In a lot of web apps that I use seriously I have extra CSS rules getting piped in through uBlock Origin. I don't have that on for any of my native Linux apps.

Yes it's still just called "developer tools", yes browsers could support more, but the entire philosophy around CSS as a user-extensible styling tool and HTML as something that can be queried and manipulated on the fly by multiple agents is something that's always been embraced more in browsers than on native platforms (limited OS styling options aside).