IFrames are not supported with XHTML 1.0 Strict Doctype.
When you use IFrame and your doctype is XHTML 1.0 Strict, then you cannot pass the W3C Markup Validation test. You always get errors.
The errors are like:-

Scenario:
You have set up google apps for your domain. Let the link be:- https://www.google.com/a/domain.com/
Now, you forgot the admin password.

I used to have google adsense in my blog but they suddenly disappeared these days. I don’t see the adsense in my blog. Instead, I see ads stating ‘Microfinance Empowers‘ in some of my adsense block. Others are empty.
I googled the web and found the following cause and solution:-

I’m human, Google !

I was googling something and google suddenly said sorry to me. It says my computer is sending automated queries. I was just googling “magento programmer developer nepal” by changing the word position at each time. I just googled this way for at most 5 times.
Google help says the following thing about this issue:

The OpenSocial API is a set of common APIs for building social applications on many websites. There are two ways to access the OpenSocial API: client-side using the JavaScript API, and server-side using REST or RPC protocols.
JavaScript API

This article will provide you step by step guide to setup Google AdSense.

Today, I got an email from adsense-noreply@google.com with the subject “We are retiring AdSense Referrals”. It says that during the last week of August, the AdSense referrals feature will be retired for both AdWords advertiser products and Google products. Beginning in late August, any remaining referral ads on your site will no longer work, and will appear as blank space on your website. In order to prevent a decrease in your AdSense earnings, replace all referral ad code on your sites with AdSense for content ad code prior to the …