What's preventing browsers from rendering a common subset of markdown without the need for browser extensions, with fallback to the current default of plaintext if parsing fails? LLM output can be copy-pasted for rendering by chat messengers and notetaking apps (e.g. DevonThink). If LLM markdown output continues to proliferate, does it become the defacto common-by-volume subset of Markdown, which browsers could standardize and render?