Initiate a CSS animation within an iframe once the iframe becomes visible on the screen

Currently, I am working on creating HTML5 banner ads for Google AdWords using CSS animations. One challenge I have encountered is that due to the time restrictions of 30 seconds for animations in each ad, users may not always see all stages of the animation.

I am curious if there is a method to determine the viewport of the parent window, even if it is from a different domain, in order to trigger the animations in my ad's CSS/JS code only when they are actually visible to the user?

Any assistance on this matter would be greatly appreciated! Thank you!

Answer №1

There are a couple of strategies you can employ to tackle your issue.

The first method involves making changes to the code in your parent window across different domains. If this is not feasible for you (which seems likely), you may need to incorporate event listeners and utilize Window.postMessage.

Alternatively, you can explore the capabilities of the Intersection Observer API. This API is tailored to address your specific needs, but bear in mind that its support is currently limited. Refer to the link provided or visit caniuse to check its compatibility. In cases where it's not available, consider implementing a straightforward fallback option.

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