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Document.write() Detector

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

Collect 39+ data points and validate against IAB ad guidelines

HTML5 Zip
Ad Tag
VAST
Video
Image
Audio
 
smart_display settings_system_daydream panorama
Drop your HTML5 Ad here
Format: ZIP
auto_stories
API Docs
Go ahead, try
it yourself !

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.