Monday, March 26, 2018 Google in their webmaster central blog announced that they are rolling out mobile-first indexing. There are couple points I shared in the video and here are the link of those points if you want to take a look.
Googlebot User Agent for Smartphone
Read this instruction as well to identify the Googlebot web crawler presence in your server. Also, see this tweet by John Mueller where he mentioned a PHP script to find out the correct Googlebot
Curious which Googlebot is indexing a page – mobile-indexed or desktop? Try out this awesome PHP script from @jonoalderson , and double-check the cached page in search from time to time. https://t.co/RMnNAvRMKV
— John ☆.o(≧▽≦)o.☆ (@JohnMu) March 20, 2018
Eric Bidelman’s Tweet
PSA: Google Search crawler 🤖 is based on Chrome 41 , which does NOT support CSS Custom Properties . If your layout/design relies on vars, make sure you’re compiling CSS so your page renders properly. I wasn’t 😢
— Eric Bidelman (@ebidel) February 28, 2018
Another Chrome engineer Domenic Denicola replied which makes total sense. See the other replies as well including this one from Tomek Rudzki.
Seems strange it would be making UX judgments based on a multi-year old browser engine that doesn’t reflect any actual users. (The “U” in “UX”.)
— Domenic Denicola (@domenic) March 1, 2018
And this is actually the first tweet where Ilya Grigorik (Web performance engineer at Google) first tweeted that Google search rendering is based on Chrome 41
— Ilya Grigorik (@igrigorik) August 4, 2017
Chrome 41.0.2272.96 Features
Check out the following three links to get more sense on this specific version
Also, yesterday ( March 28th, 2018) John Mueller did an AMA (ask me anything) on Reddit. It’s vast but worth checking out the mobile first indexing questions and replies there.
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