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Largest Contentful Paint (LCP)
This article discusses the Largest Contentful Paint (LCP) metric, which measures how quickly the main content of a web page loads and is visible to users. It explains which elements are considered, how the size of the element is determined, and how the metric differs from the First Contentful Paint (FCP) metric. It also provides examples of how LCP is reported, how to measure LCP in the lab and in the field, and how to improve LCP.
What is Largest Contentful Paint (LCP)?
Largest Contentful Paint (LCP) is a metric that reports the render time of the largest image or text block visible within the viewport, relative to when the page first started loading.
What elements are considered for LCP?
The types of elements considered for LCP are elements,
How is an element's size determined for LCP?
The size of the element reported for Largest Contentful Paint is typically the size that's visible to the user within the viewport. If the element extends outside of the viewport, or if any of the element is clipped or has non-visible overflow, those portions do not count toward the element's size. For image elements that have been resized from their intrinsic size, the size that gets reported is either the visible size or the intrinsic size, whichever is smaller. For text elements, only the size of their text nodes is considered (the smallest rectangle that encompasses all text nodes). For all elements, any margin, padding, or border applied via CSS is not considered.
How is LCP different from First Contentful Paint (FCP)?
LCP measures when the main content is painted, so it is intended to be more selective than FCP which measures when any content is painted to screen.
How can LCP be measured?
👍 This article provides an in-depth and comprehensive overview of the largest contentful paint (LCP) metric, its importance, and how to measure it.
👎 This article is overly long and could be shortened to make the information more concise and easier to comprehend.
Me: It's about Largest Contentful Paint (LCP). It explains how to measure the time it takes for the main content of a web page to load, and what a good LCP score is. It also explains how elements are determined to be the largest contentful element, and how to measure LCP in the lab and in the field.
Friend: That's interesting. It seems like this metric could be very useful for web developers. What are some of the implications of this article?
- Research the Core Web Vitals metrics thresholds and define them for your website.
- Implement the Largest Contentful Paint API to measure the render time of the largest image or text block visible within the viewport.
- Largest Contentful Paint (LCP)
- A metric that reports the render time of the largest image or text block visible within the viewport, relative to when the page first started loading.
- First Contentful Paint (FCP)
- A user-centric performance metric that captures the very beginning of the loading experience.
- First Meaningful Paint (FMP)
- A performance metric that captures more of the loading experience after the initial paint.
- Speed Index (SI)
- A performance metric that helps capture more of the loading experience after the initial paint.
- Containing Block
- A CSS term that refers to the element that contains a given element.
- Timing-Allow-Origin Header
- A security header that allows a web server to specify which origins are allowed to read timing information.
- Font Block Period
- The period of time between when a web font is requested and when it is available for use.