Hi,
Thank you for reaching out to us.
According to the policy page you linked, the headline of a native ad may be truncated after 25 characters. This means that you can truncate the headline after 25 characters, but if the headline is less than 25 characters long, you do not need to truncate it. To answer your questions, your both questions are not recommended, as truncating either in after 17 characters or 25 characters then truncating after 10 characters is not recommended as per the policy article. You may also check this article (https://support.google.com/admob/answer/6329638?hl=en&ref_topic=7384666&sjid=15289639488855362483-AP) for Native ads policies & guidelines as it mentioned that you need to ensure that there is no truncation of text up to 25 characters, and this (https://support.google.com/admob/answer/6240814?hl=en&ref_topic=7384666&sjid=15289639488855362483-AP) native ads policy compliance checklist.
I hope this answers your questions. Let me know if you have any other questions.
Additional information:
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Mobile Ads SDK Team |