Document.write() Detector

Upload Your HTML5 Ad to detect if it uses synchronous JS methods.

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smart_display settings_system_daydream panorama

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Uses document.write()

This checks if the ad uses the outdated document.write() method in JavaScript.

Why do we test it?

The document.write() function is no longer recommended due to its potential to block other page content from loading. Avoiding it ensures the ad is compatible with modern web standards.