They watch for window.open calls, especially ones fired without a direct user gesture like a click or keypress, which often signals ads. In contrast, SPA navigation usually uses the History API (pushState/replaceState) and keeps everything in the same tab without spawning windows. Timing matters too: popunders often open immediately or on delayed scripts, while real navigation follows user interaction patterns. Blockers also check if the new window is hidden, off-screen, or loses focus right away. Patterns in known ad scripts and domains help.
Ask How do ad blockers tell popunder ads apart from legit single-page app navigation events?
- Thread starter Dean101
- Start date
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