Web performance is a critical aspect of user experience and SEO, impacting everything from conversion rates to search engine rankings. Among various performance metrics, Content Layout Shift (CLS) is pivotal, focusing on visual stability during the loading phase. High CLS scores can frustrate users by causing unexpected layout shifts. Here, we explore seven strategies for minimizing CLS, including practical code examples for a smoother web experience.
Optimize Image and Video Sizes
Why It Matters: Images and videos that load without defined dimensions can drastically alter the layout of a page, leading to high CLS scores.
Strategy: Always specify width and height attributes for your media. This approach reserves the necessary space and prevents layout shifts.
Code example:
/* Aspect ratio box for a 16:9 ad or embed */
.aspect-ratio-box {
position: relative;
width: 100%;
padding-top: 56.25%; /* 16:9 Aspect Ratio */
}
.aspect-ratio-box-content {
position: absolute;
top: 0;
left: 0;
width:
