Google Delays Mobile-First Indexing Deadline to March 2021

Google had set September 2020 as the deadline for when it would begin to fully switch over to crawling and indexing sites using mobile-first indexing but announced today that site owners will have more time to prepare. The deadline has been extended to March 2021.

Mobile-first indexing is a long-term plan that Google began rolling out in July 2019 by enabling it for new domains. The company cited “these uncertain times” as the reason for delaying the next phase of the rollout. The announcement also referenced further testing that showed a number of common issues sites are having in making the transition. Google urged site owners to pay close attention to several important issues:

  • Robots meta tags on mobile version should match the desktop version or Google may fail to index or follow links on the page.
  • Do not lazy-load primary content based on user interactions (like swiping, clicking, or typing), because the Googlebot doesn’t trigger these user interactions.
  • Avoid the bad practice of using smaller images on mobile to fit the smaller screen. Small and low quality image will not be favorably indexed.
  • Ensure content on the mobile version matches the desktop, since only the mobile version will be used for indexing and ranking in Search.
  • Include meaningful alt text for images.

Google also outlined several other tips for image and video markup and placement. The announcement is essentially a tutorial for how to improve common mistakes that can negatively impact mobile ranking and indexing.

Since mobile-first indexing is already enabled for most currently crawled sites, some speculated that the delayed deadline was due to hastily migrated mobile subdomain sites. John Mueller, Webmaster Trends Analyst at Google, confirmed this is the case and advised site owners to avoid this dated approach and update at the nearest opportunity.

Before the advent of responsive design, many WordPress site owners added plugins that would create a separate mobile site to provide a more mobile-friendly browsing experience. Website visitors soon expected the entire web to be available to them on the devices they carried around in their pockets. This is now the primary way that people interact with the web, and Google’s mobile-first indexing is a reflection of this new reality.

If your WordPress site is still relying on a plugin to create a separate mobile site, or if you are using a plugin for lazy loading, make sure that the solution you have in place is following Google’s mobile-first indexing best practices. There are still 9 months remaining before Google makes mobile-first indexing and ranking the default for the entire web.

4 responses to “Google Delays Mobile-First Indexing Deadline to March 2021”

      • Google does appear to support lazy-loading via javascript so not sure why they worded it odd. They appear to only dissuade the use of lazyloading based on user interactions like clicking etc. :
        https://developers.google.com/search/docs/guides/lazy-loading

        “Here are a few examples on how you can do this:

        Native lazy-loading for images and iframes.
        IntersectionObserver API and a polyfill
        A JavaScript library that supports loading data when it enters the viewport.”

        They also give a great example of IntersectionObserver API in action here:
        https://web.dev/lazy-loading-images/

    • I want to add that JS lazy loading still has performance advantages. The native lazy loading functionality isn’t supported in all browsers but outside of that, it has the disadvantage of having a very large range for when it starts downloading images.

      For instance, a typical lazy load plugin will fetch images in viewport immediately + 300 pixels maybe less outside of the viewport. However, native lazy load does the viewport + 1500 (most recent revision) which is substantially larger and is too eager. You will still see performance gains, at least for now by using the a JS library.

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