Image element src property does not allow URL assignment

Bug Report

🔎 Search Terms

image src dom

🕗 Version & Regression Information

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about 4.3.0

⏯ Playground Link

Playground link with relevant code

💻 Code

let image = document.createElement('img');
image.src = new URL("http://google.com");
console.log(image.src)

🙁 Actual behavior

Type 'URL' is not assignable to type 'string'.(2322)

🙂 Expected behavior

Compiles cleanly (confirmed supported per https://github.com/whatwg/html/issues/6440)

[DanielRosenwasser]

So hard-coding URL doesn’t make sense to me.

We’d want to be more permissive to a degree; letting anything in with a toString() seems undesirable, whereas unblocking a scenario like assigning URL instances to ~a property called url~ the src property seems reasonable.

[domenic]

It’s more subtle than that. Every DOMString or USVString will convert any input to a string. Technically, everything in JavaScript is convertible to a string, at the very least through Object.prototype.toString(). So hard-coding URL doesn’t make sense to me.