![]() ![]() One reason that CLS is different is that it is measured through the lifetime of the page - that’s the “cumulative” part of the name! The other two Core Web Vitals stop after the main component is found on the page after load (for LCP), or for the first interaction (for FID). That’s not to say solving issues with these two metrics are easy, but they are reasonably well-understood problems. Optimizing that is usually a matter of cleaning up (or reducing!) your JavaScript and is usually site-specific. How to optimize your LCP should be a relatively well-understood problem for most web pages.įirst Input Delay (FID) measures any delays in interactions and seems not to be a problem for most sites. Yes, we’ve changed how we defined the user experience of the page load to look at the loading speed of the most relevant content, but it’s basically reusing the old techniques of ensuring that the content loads as quickly as possible. Looking briefly at the other two Core Web Vitals, Largest Contentful Paint (LCP) does exactly as its name suggests and is more of a twist on previous loading metrics that measures how quickly the page loads. It’s a very different beast to the other two Core Web Vitals. So, it often requires new techniques and ways of thinking to attempt to optimize it. ![]() Why CLS Is DifferentĬLS is, in my opinion, the most interesting of the Core Web Vitals, in part because it’s something we’ve never really measured or optimized for before. However, I will give a little background needed to understand some of the techniques. Nor will I talk too much about the mechanics of how CLS is calculated: Google has some good documentation on that, and Jess Peck’s The Almost-Complete Guide to Cumulative Layout Shift is an awesome deep dive into that too. I’m not going to talk too much about measuring CLS as I’ve covered that already in a previous article. In this article, I’m going to discuss some front-end patterns to reduce CLS. These shifts of content are very annoying, making you lose your place in an article you’ve started reading or, worse still, making you click on the wrong button! It calculates a score based on how much of the page is unexpectedly moving about, and how often. The Cumulative Layout Shift metric is causing trouble to a lot of sites, so let’s have a look at ways of addressing any issues for that metric.Ĭumulative Layout Shift (CLS) attempts to measure those jarring movements of the page as new content - be it images, advertisements, or whatever - comes into play later than the rest of the page. If a message is updated, use a new block_id.Google’s Core Web Vitals initiative has taken the SEO and Web Performance worlds by storm and many sites are busy optimizing their Page Experience to maximize the ranking factor. ![]() block_id should be unique for each message and each iteration of a message. Maximum length for this field is 255 characters. You can use this block_id when you receive an interaction payload to identify the source of the action. ![]() If not specified, a block_id will be generated. There is a maximum of 25 elements in each action block.Ī string acting as a unique identifier for a block. For an actions block, type is always actions.Īn array of interactive element objects - buttons, select menus, overflow menus, or date pickers. The lists of fields and values below describe the JSON that apps can use to generate each block: Block typeĪvailable in surfaces: Modals Messages Home tabsĪ block that is used to hold interactive elements. You can include up to 50 blocks in each message, and 100 blocks in modals or home tabs. Read our guide to building block layouts to learn where and how to use each of these components. Blocks are a series of components that can be combined to create visually rich and compellingly interactive messages. ![]()
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