Using Claude Code: The Surprising Power of HTML

When using Claude Code, leveraging HTML instead of Markdown as the output format can produce much richer results, including visualizations, colors, diagrams, and interactivity.

The Limits of Markdown and the Advantages of HTML Markdown is simple and portable, but it lacks the expressiveness needed for an agent to convey complex information. HTML, on the other hand, can effectively implement tables, illustrations, interactive UIs, and animations through CSS, SVG, and JavaScript. In addition, HTML can be easily shared via a browser, which is advantageous for collaboration and review.

Integration with Claude Code Claude Code can read context from the file system, MCP (Model Context Protocol), the browser, and Git history to weave together HTML outputs. Without any special skills, simply asking it to "create an HTML file" is enough to generate various forms of Artifacts.

Key Use Cases

• Specs and Planning: Visualize multiple ideas as an HTML grid to compare them, or write out detailed implementation plans.
• Code Review: Visually render code diffs, flowcharts, and module structures to provide an intuitive review environment.
• Design Prototyping: Quickly sketch and test interactive UIs that include animations and sliders.
• Reports and Research: Synthesize various data sources to create visualized interactive reports or slide-form deliverables.

However, HTML has drawbacks: it takes 2 to 4 times longer to generate than Markdown, and text-based version control (diffing) is more difficult.