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Document.write() Detector

Scan your ad tag to detect if it uses synchronous JS methods.

Check 32+ ad quality tests for ad performance — validate against IAB display ad guidelines

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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.