You asked Claude, ChatGPT or Cursor for a quick internal tool: a pricing calculator, a chart over last quarter's numbers, a clickable onboarding checklist. It works on your machine. Now a product manager, a client or your finance lead needs to open it, and they are not going to clone a repo or run npx serve .

This post is the checklist I run before I send one of these files to anyone. Most of it is about making the HTML genuinely self-contained. The last part is about getting it to people as a URL instead of an attachment.

Pitfall 1: Relative asset paths that only exist on your disk

LLMs love to write <img src="chart.png"> or <link rel="stylesheet" href="styles.css"> because that is what a "real" project looks like.…