If you want to use an HTML element in vanilla JavaScript without using a function like Document.createElement(), you need to use it like this:
const App = `<h1>Hello, world</h1>`;
But is there a way to do this in vanilla JavaScript, just HTML tags without a string declaration (signs like ``)? For example:
const App = <h1>Hello, world</h1>;
There is no way you can do this without a declaration (but you still can do this without a string declaration). For that, you have to use JSX in Vanilla JS using this npm package: https://www.npmjs.com/package/jsx-vanilla
This unlock more features like embedding dynamic expressions and values in between the HTML code. For an example:
let x = 4;
const menu = (
<ul>
<li>{x-1}</li>
<li>{x}</li>
<li>{x+1}</li>
</ul>
);
const node = document.createRange().createContextualFragment(menu);
Technically, JSX is neither string nor HTML.