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CSS Embedded Tester

Upload your HTML5 Ad to check if all CSS is embedded.

Check 39+ ad quality tests for ad performance — validate against IAB HTML5 ad guidelines

Go ahead, just
drop your ad !
HTML5 Zip
Ad Tag
VAST
Video
Image
Audio
smart_display settings_system_daydream panorama
Drop your HTML5 creatives here
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Validate against:
Ad Spec: IAB Ad Guidelines
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CSS Embedded

This test checks if CSS is embedded directly in the index.html file of an HTML5 ad rather than linked externally.

Why do we test it?

Embedding CSS directly in the index.html file of HTML5 ads is highly recommended for ensuring seamless delivery and performance. It avoids additional server requests that slow down loading times. Also, self-contained ads prevent potential disruptions if linked files are unavailable or modified.