🔍 Core Updates: News from Google I/O 2026 and the May 2026 core update begins [25 May]


SEO tips and updates from Mark Williams-Cook
Search with Candour hosted by Jack Chambers-Ward

SEO updates you need to know


🔍

Google launches the Intelligent Search Box, the "biggest change to the search box in 25 years". This new version of the search box adapts to your query, expanding and offering new modalities more easily.

🛒

Google announces Universal Cart, an AI-powered omnipresent checkout experience. Universal Cart will work across multiple Google platforms to provide discounts, recommendations and unified checkout using Google Pay.

🔄

The Google May 2026 core update begins rolling out. The second core update of 2026 began rolling out on 21 May 2026 and may take up to 2 weeks to complete.

🔦

Google adds llms.txt to Chrome Lighthouse checks. This addition to the 'Stability and Discoverability' section is part of Google's growing advice for making agent-friendly websites.

💰

New ad types, Conversational Discovery and Highlighted Answers, are coming to AI Mode. Why is this relevant for SEO? The integration of ads, especially within the Highlighted Answer section, could affect CTR for organic results.

📊

Microsoft Clarity adds AI citation information to its user data. The data is similar to the recent Bing Webmaster Tools update and also includes which queries are being grounded.

🤖

Cloudflare launches a tool to check if your website is AI agent-friendly. This site will give an Agent Readiness score out of 100, including a detailed breakdown of what is and isn't working for your website.

Sponsor: Trendos

See Who’s Buying Ads in ChatGPT Answers

Competitors are paying to show up in the ChatGPT answers your customers read every day and there’s no ad library to catch them.

Trendos.com just changed that.

New Ad Radar feature captures every sponsored AI placement so you know exactly who is advertising, what they’re saying, and how often they appear.

  • Impression share: See who dominates visibility.
  • Ad copy: Track exact messaging shifts in real time.
  • Final URL: Reverse engineer their funnel strategy.

People asking AI for recommendations aren't just browsing - they're deciding. Make sure you know exactly who is shaping their decision.

Sign up free today. 100 custom prompts included. See who is buying ads next to your brand.

Search with Candour podcast

HiveMCR 2026 recap

Season 4: Episode 72

Jack Chambers-Ward gives a recap of his experience at HiveMCR 2026 including all of the talks, panels and events over the two-day event hosted by Charlie Whitworth.

The event included live music, stand up comedy and talks from Jono Alderson, Dawn Anderson, Alex Moss, Sophie Brannon and many more.

This week's solicited tips:

I'm not leaving my A2A up to chance

If you want to get the inside track on Agent2Agent (A2A) protocols, and what you might need to be thinking about, there's an easy way to do that! ⤵️

You can join the Internet Engineering Task Force (IETF) agent2agent mailing list, and get the discussions, proposals, and disagreements that are happening on this topic every day. 📨

I've found this really helpful, just to start slowly moving my thinking into the space it needs to be for the future, so it doesn't feel like a "cold start" when this future comes around!

I'm an SEO, classifying queries is part of my religion

⚒️ New tool! The Google exploit we published in 2025 proved among other things, that Google classifies queries into one of 8 categories ⤵️

I am soft launching this free tool on QueryClassifier[dot]com, which is a server running a fine-tuned DistilBERT model that has been trained on 4.8M English queries and category pairs from the Google exploit data. 😎

You can paste or upload up to 10,000 keywords, and the model will run in realtime and give you a prediction on how Google will categorise those queries.

🤔 Why is this important?

> There are commonalities that Google is looking for on each query type. For instance, there is a substantial difference for "SHORT_FACT" if you lead with the answer vs build up to it

> These types relate to what kind of SERP features are present

> I have been doing some larger studies of SERPs vs these categories, and I hope making this information available at scale will encourage other SEOs to do their own research publish their findings.

More examples, details, and videos coming on this soon 😎

I can bring you in 200, or bring you in 404

Here is one of the sneakiest technical SEO things I've encountered a couple of times with caching. ⤵️

🖥️ As one of their standard pre-crawl checks, Sitebulb will request a "made up" URL to make sure the server respond correctly with a 404 Not Found HTTP Header. This is to ensure among other things, you don't generate lots of Soft 404s, or even worse, get these pages indexed.

🤖 A few times, including this year, I have encountered setups which can still generate this problem, but get past this initial 404 check. What I discovered was happening:

1) A user requests a URL that does not exist, the server correctly responds with an HTTP/404 code, and shows the user a "Page Not Found" page.

2) However, because of how the caching is setup on the server, it creates a cached version of the page it has just served.

3) If the user (or anyone) requests that same 'broken' URL, the first thing the server does is check its cache for that page - and it exists! So it will return an HTTP/200 code and then show the user a "Page Not Found" page.

🔥 This could obviously lead to all kinds of other issues. So as standard, I will ping 404 URLs twice to make sure this isn't happening.

Hope this helps someone else :D

Technology means more than you will ever know

Internationalisation is not just about language and culture, it's about technology too. 💡

While there are benchmarks set for what is a 'green', 'amber' and 'red' score for Core Web Vitals performance when you run a 'lab' text, it is very important to remember that the measurement of these by you is not objectively applied to everyone.

What do I mean by that?

You may run a test and get 3 'green lights' and believe everyone is fine. However, when you login to Google Search Console, you see you're in the red because the majority of users are perhaps from a country where the average internet connection is much slower.

In cases like this, it may be that you literally have to build a 'lighter' version of your site to serve these regions adequately. This is all part of internationalisation!

JavaScript is the way

“There is no such thing as a rendering budget” ~Martin Splitt

Google used to have a heuristic to decide which pages were rendered; not anymore, everything is rendered.

Photo from Athens SEO

Refer subscribers and earn rewards!

If you enjoy reading Core Updates, you can earn £1000's of free access to software and tools by referring your friends to sign up using your personal referral link.

Your referral link: [RH_REFLINK GOES HERE]


Here are the fantastic rewards on offer:

Refer 3 Subscribers:
Get tagged in a LinkedIn post to thank you for your support

Refer 10 Subscribers:
Get included in a Core Updates email as a supporter

Refer 25 Subscribers:
Get 1 month free subscription to Liam Fallen’s MostlyMarketing Slack

Refer 50 Subscribers:
Get 1 month free AlsoAsked Lite subscription

Refer 75 Subscribers:
Get a free copy Majestic’s SEO in 2025 book (20 to give)

Refer 100 Subscribers:
Get 3 months free InLinks Freelancer subscription

Refer 150 Subscribers
Get free access to Kyle McGregor’s Google Analytics 4 course

Refer 200 Subscribers:
Get free access to Mark Williams-Cook’s Complete SEO course

Refer 250 Subscribers:
Get 1 year free subscription to Sitebulb Pro

Refer 300 Subscribers:
Get free access to Mark Rofe’s Digital PR Course

Refer 404 Subscribers:
Get 1 year free subscription to Little Warden Small team

Refer 500 Subscribers:
Get 1 year free AlsoAsked Pro subscription

Your referral link:

[RH_REFLINK GOES HERE]

Facebook Twitter Whatsapp Telegram Linkedin Email

PS: You have referred [RH_TOTREF GOES HERE] people so far

See how many referrals you have

Top Core Updates referrer leaderboard

A big thank you to our top referrers, who have signed up over 10 people to the Core Updates newsletter, go follow them!

🥇 MJ Cachón Yáñez (LinkedIn / Bluesky)

🏅 Nikki Pilkington (LinkedIn / Bluesky)

🏅 Lidia Infante (LinkedIn / Bluesky)

🏅 Saijo George (LinkedIn / Bluesky)

🏅Alice Rowan (LinkedIn)

🏅Martijn Jeurissen (LinkedIn)

🏅Chester Beard (LinkedIn)

Candour, 30-34 Muspole Street, Norwich, Norfolk NR31DJ
Unsubscribe · Preferences

Core Updates SEO Newsletter

The Core Updates newsletter is written by Mark Williams-Cook, a veteran SEO who is Digital Marketing Director at Candour, Founder of AlsoAsked and organiser of SearchNorwich. Over 40,000 SEOs follow Mark's 'Unsolicited #SEO tips' on LinkedIn, which has now been wrapped up into the Core Updates newsletter, along with an overview of weekly news and the current episode of the Search with Candour episode, hosted by Jack Chambers-Ward.

Read more from Core Updates SEO Newsletter

SEO tips and updates from Mark Williams-CookSearch with Candour hosted by Jack Chambers-Ward SEO updates you need to know 📖 Google released a new guide on "Optimizing your website for generative AI features on Google Search". This GEO/AEO guide highlights best practices, as well as dispelling myths around llms.txt, markdown and chunking. 📊 GA4 adds a new AI Assistant channel for measuring traffic from AI search. This new channel can be found in the Default Channel Group report. A new Medium,...

SEO tips and updates from Mark Williams-CookSearch with Candour hosted by Jack Chambers-Ward SEO updates you need to know 🔗 Google adds new updates to links in AI Mode and AI Overviews. These new features include more suggested links to further explore topics, hover previews for citations and highlighting links for users' news subscriptions. 📍 Reddit threads are now being directly pulled into some Google Business Profiles on desktop, primarily for food and drink businesses via new “About this...

SEO tips and updates from Mark Williams-CookSearch with Candour hosted by Jack Chambers-Ward SEO updates you need to know ❇️ Gemini in Chrome begins worldwide rollout. This integrates Google's AI directly into the browsing experience, including encouraging users with an 'Ask Gemini' button added to the top right of Chrome. 🕴️ Google creates guidance for building agent-friendly websites. This new guide explains that agents use three primary methods: screenshots, HTML and the accessibility...