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Is 'large rectangle (336x280)' ad unit allowed in mobile display?

     
5:14 pm on Oct 15, 2018 (gmt 0)

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Is 'large rectangle (336x280)' ad unit allowed in mobile display?
It is mentioned here and it seems that it is allowed:
[adsense.googleblog.com...]

But on this link you can see that it isnt allowed:
[support.google.com...]

So what's right?
thanks
5:33 pm on Oct 15, 2018 (gmt 0)

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The second link doesn't say that it is not allowed. If anything it say that is not a "Top performing ad sizes" in mobile. I would even question the validity of that, I assume that the post is old.

Responsive ads are formatted to span the full screen width. Given that most mobile screens are now at least 360px wide or wider. At 336px the ad unit is narrower than the full width.
5:47 pm on Oct 15, 2018 (gmt 0)

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You are right about the responsive ad unit, the quistion is if its damages performance in any way
It makes sense that a larger ad will get better results, so the question is what is better in terms of Google.
5:51 pm on Oct 15, 2018 (gmt 0)

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the question is if its damages performance in any way

You can set up an a/b test to try and answer the question. It is really easy.
In Adsense go to Optimizations -> Experiements -> An Unit Settings.
6:32 pm on Oct 15, 2018 (gmt 0)

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I've checked it right now, and there's no option to run an experiment to know which ad size is better
6:40 pm on Oct 15, 2018 (gmt 0)

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there's no option to run an experiment to know which ad size is better

Unfortunately you appear to be right. You would have to put together your own test.
6:48 pm on Oct 15, 2018 (gmt 0)

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Still my question about the size(336X280) if it is allowed on mobile,
Because in recent days the coverage on mobile display ONLY dropped to 50% coverage
Compared to 90% Usually
7:00 pm on Oct 15, 2018 (gmt 0)

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Simply, yes it is allowed.

There are caveats, but they are not specific to any given size, basically you need to ensure that you have a sufficient amount of content to warrant the ads. If you stuff a 336 x 280 ATF with only a menu showing then, that would be against the policy. An often sited ratio, that comes from the IAB Better Ads Standard, is a ratio of no more than 30% ads to content (based on vertical height).
7:05 pm on Oct 15, 2018 (gmt 0)

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That page is from pre-responsive era. Check [support.google.com...] for best practices for mobile.
6:40 pm on Oct 16, 2018 (gmt 0)

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Yes 336 x 280 is allowed on mobile and I use them. But I earn more per ad from the 300 x 250. My personal belief is that the quality of 300 x 250 is better and that's why it performs better.
8:57 pm on Oct 22, 2018 (gmt 0)

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As far as I know 336x280 isn't allowed at the top of the page for mobile devices. I had a warning once from Adsense that I could only use 300x250 at the top.

And about 300x250 performing better than 336x280 doesn't make sense at all. Competition with 336x280 and 300x280 is much bigger than only 300x280.