Andre Alpar ran a test to see if 12 different AI assistants render JS or not.

Smart setup: each assistant got a unique, secret, never-linked URL. The page's raw HTML had a "decoy code" and the real code was injected with JS. Each page also had a unique string that returned only if the page was actually fetched (to sniff out lying/hallucinating assistants).

The results:

• All of the US assistants read raw HTML *only* (including GEMINI and all the big ones)
• The Chinese assistants (DeepSeek, ERNIE, Quen, Kimi) and Mistral render JavaScript

If you've got important content that you want available to AI assistants, make sure it's in the source HTML! At least for now.