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The IMA SDK must be able to tell when ads are visible to users so that it can
send the correct signals back to the ad server. IMA uses
Active View reporting
to measure the viewability of ads. This guide explains how Active View
reporting works with IMA, as well as how to verify that the SDK is able to
correctly capture viewability signals.
How Active View reporting works with the IMA SDK
The publisher designates a video element when creating the
StreamManager.
As long as the video element is viewable and unobstructed when the
StreamRequest
is made, Active View receives measurements on that element.
Verifying that the SDK can measure ad viewability
To check whether that the SDK is able to capture viewability signals, look for
network requests sent to https://pagead2.googlesyndication.com/pcs/activeview
and check for the mtos parameter. For more information, see
Monitor Active View measurement.
The following sample stream is available for viewability testing:
CMS ID: "2556080", video ID: "tears-of-steel-omid"
To test using this stream, first check the network logs for
ima-test-verification.js to be downloaded and then a ping fired to
https://pagead2.googlesyndication.com/pagead/gen_204 at the start of ad
playback.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-20 UTC."],[[["\u003cp\u003eThe IMA SDK leverages Active View reporting to determine ad visibility and send corresponding signals to the ad server.\u003c/p\u003e\n"],["\u003cp\u003ePublishers need to designate a video element during StreamManager creation for Active View to measure viewability.\u003c/p\u003e\n"],["\u003cp\u003eVerifying successful viewability signal capture involves checking for specific parameters within HTTP requests and network logs.\u003c/p\u003e\n"],["\u003cp\u003eA sample stream with CMS ID "2556080" and video ID "tears-of-steel-omid" is available for testing viewability implementation.\u003c/p\u003e\n"],["\u003cp\u003ePublishers with custom video displays might need layout adjustments to ensure accurate metric returns and can consult the IMA support forum for assistance.\u003c/p\u003e\n"]]],[],null,["# Verify Active View\n\nThe IMA SDK must be able to tell when ads are visible to users so that it can\nsend the correct signals back to the ad server. IMA uses\n[Active View reporting](//support.google.com/admanager/answer/3154105)\nto measure the viewability of ads. This guide explains how Active View\nreporting works with IMA, as well as how to verify that the SDK is able to\ncorrectly capture viewability signals.\n\nHow Active View reporting works with the IMA SDK\n------------------------------------------------\n\n1. The publisher designates a video element when creating the\n [`StreamManager`](/interactive-media-ads/docs/sdks/html5/dai/reference/js/StreamManager).\n\n2. As long as the video element is viewable and unobstructed when the\n [`StreamRequest`](/interactive-media-ads/docs/sdks/html5/dai/reference/js/StreamRequest)\n is made, Active View receives measurements on that element.\n\nVerifying that the SDK can measure ad viewability\n-------------------------------------------------\n\nTo check whether that the SDK is able to capture viewability signals, look for\nnetwork requests sent to `https://pagead2.googlesyndication.com/pcs/activeview`\nand check for the `mtos` parameter. For more information, see\n[Monitor Active View measurement](//support.google.com/admanager/answer/6123557).\nThe following sample stream is available for viewability testing:\n\n\u003cbr /\u003e\n\nCMS ID: \"2556080\", video ID: \"tears-of-steel-omid\"\n\nTo test using this stream, first check the network logs for\n`ima-test-verification.js` to be downloaded and then a ping fired to\n`https://pagead2.googlesyndication.com/pagead/gen_204` at the start of ad\nplayback.\n\n| **Note:** If you use your own video display and maintain full control over playback, you might need to modify your layout to ensure that the necessary metrics are being correctly returned. For additional assitance, reach out to us on the [IMA support forum](//groups.google.com/g/ima-sdk)."]]
