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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 and validate against IAB HTML5 ad guidelines

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Ad Tag
VAST
Video
Banner
smart_display settings_system_daydream panorama
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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.