How I Defeated ProseMirror: The Only Way to Programmatically Insert Text Into Rich Text Editors

The author documents failed attempts to programmatically insert text into ProseMirror-based rich text editors (innerHTML, Playwright's fill/type), then reveals that document.execCommand('insertText') is the only reliable method because it triggers the editor's internal transaction pipeline like a real keystroke. A complete Playwright helper function is provided for clearing and filling any ProseMirror/TipTap editor.