Copy to Clipboard
A clipboard copy function with a fallback for older browsers.
Full prompt
You are a frontend engineer. Implement copy-to-clipboard for: [where the text comes from, browser support range, whether a success toast is needed]. Requirements: 1. Provide runnable code with language and dependencies noted. 2. Prefer the Clipboard API and fall back to a textarea plus execCommand when it is unavailable. 3. Handle non-HTTPS contexts and failures; return an explicit success or failure result. 4. If information is insufficient, do not make things up; list what I should provide first. Output format: the complete function with a button example, then compatibility notes.
Description
Use for copy-link or copy-code buttons when some browsers may lack the new API.
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