iFrames not appearing on Google Chrome

[Anonymous]

Hello,

Trying to pull in a Marketo form through an iFrame. We've noticed Chrome will randomly reject the iFrame and not load the form. We can't consistently recreate the bug, but I'd say it happens 50% of the time.

Anyone ever experienced this?

[SanfordWhiteman]

You'll have to provide a URL. Surely the root cause is not going to be truly random, unless you're actually generating a random number in code! More likely, you have a race condition which creates different results based on network conditions. Fixing that race will be the goal. But we need to be able to see what you're seeing first.

[SanfordWhiteman]

When it "rejects" the IFRAME, what is the console error message?

[Anonymous]

That's what's so strange - there's no console error message. We just see a red "200" that indicate the IFRAME didn't load.

[SanfordWhiteman]

Let me see if I can repro it. What version of Chrome/Mac, and are you opening and closing Incognito to trigger the issue, or can you trigger it within the same browser session?

[Anonymous]

I'm on Chrome 69 and macOS High Sierra 10.13.6.

I can replicate the issue multiple times in a single session in both Incognito and regular browsing.

[SanfordWhiteman]

I can repro in Chrome 69, but not in Chrome 68 (as yet). Will check in current Canary. If it's not triggerable there, then there's a pretty clear conclusion.

Will have to resume later tonight as I have to go out for a bit.

[Anonymous]

Thanks for your help, Sanford. I really appreciate you looking into this.

Please let me know what you find / what the solution could be.

Thanks again!

[SanfordWhiteman · Accepted solution]

As far as I can see, this is a Chrome 69 bug only, not existing in versions on either side of 69. Not the first time (by any means) such a thing has happened!

Chrome 70 is going to go Stable around October 16th. This means 3 more weeks of dealing with your forms not rendering, or switching to embeds.   As far as I can see the problem persists even when the IFRAMEs are the only elements in the page, so there's nothing else to trim down or tweak. It happens a lot less than 50% of the time for me, though. More like 5%.

[Anonymous]

Hey Sanford,

Thanks so much for your help! I really appreciate you diving into this. Seems like the issue is edge case and will be resolved shortly.

Thanks again!