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Code for blogpost "Using JSX for your own lightweight declarative library":
function createElement(tag, props, ...children) {
// Create a new html node element.
const el = document.createElement(tag);
// just take the first child for now
el.textContent = children[0];
return el;
const h1 = <h1>Hello, World</h1>;
//> <h1>Hello, World</h1>
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