Short-form technical notes — AI/ML, backend, and paper summaries.https://zhen.ee/https://zhen.ee/notes/anti-bot-defences-2026/https://zhen.ee/notes/anti-bot-defences-2026/The anti-bot stack has layered from IP reputation to fingerprinting to behavioural ML. Here's what each layer actually catches, where the defender economics still work, and what vision-capable agents are starting to change.Mon, 20 Apr 2026 00:00:00 GMThttps://zhen.ee/notes/dom-first-vision-fallback/https://zhen.ee/notes/dom-first-vision-fallback/A two-phase design — cheap DOM locators first, vision-model fallback when the DOM doesn't answer — that made a browser-automation agent fast enough to run at scale and robust enough to handle canvas, WebGL, and selectorless UIs.Mon, 20 Apr 2026 00:00:00 GMT