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HTML Syntax Error Detector

Scan your ad tag to check if it has syntax errors.

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

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HTML5 Zip
Ad Tag
VAST
Video
Banner

Syntax Errors

This checks for any errors in the syntax of the HTML, CSS, or JavaScript in the ad.

Why do we test it?

Syntax errors can prevent the ad from rendering correctly or functioning as intended, leading to missed impressions or poor user experience.