Deprecate `appendChild` in favor of `append`

[jimmywarting]

Acknowledgement

• I acknowledge that issues using this template may be closed without further explanation at the maintainer's discretion.

Comment

Node.append is better than appendChild in most use cases:

1. Allows appending multiple nodes at once.

2. Supports both Node and string values.

3. Reduces boilerplate and repetitive code.

Example:

el.append("Hello", document.createElement("br"), "world");

vs

el.appendChild(document.createTextNode("Hello"));
el.appendChild(document.createElement("br"));
el.appendChild(document.createTextNode("world"));

Proposal:
Mark appendChild as @deprecated in the DOM typings to encourage modern usage.

[lionel-rowe]

Mark appendChild as @deprecated in the DOM typings to encourage modern usage.

The @deprecated tag is used to mark web platform features that are officially deprecated, marked obsolete, got removed, or were never standardized, not to encourage best practices.

[jimmywarting]

Okey 🫤