The impact component measures the normal space

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For a good experience, users should be able to interact with the page within 100 milliseconds. Cumulative Layout Shift (CLS) Core Web Vitals: Cumulative Layout ShiftCore Web Vitals: Cumulative Layout Shift Cumulative Layout Shift measures the movement of visible elements and layout changes that arrive suddenly and occur during the entire duration of the page visit causing a shift after loading the site area due to resizing, with a rather bothersome. The calculation of the CLS is rather complicated and is expressed as the product of two values, the impact component and the distance component using this formula:

punteggio layout shift = componente impatto * componente distanza  occupied by an element in the window and the space it occupies after its movement . The union of the visible area of ​​the element before and after the movement determines the percentage of the total view Canada WhatsApp Number Data  and therefore its impact component. The distance component is the greatest distance an unstable element has covered in the box while moving (horizontally or vertically) divided by the largest size of the box (width or height, whichever is greater) and is always measured in percentage. The CLS is therefore the product of these two components and for a good UX it should be less than 0.1. Example of Cumulative Layout ShiftExample of Cumulative Layout Shift.




The image above shows a block of text - which takes up half the visible part of the screen - moving down 25% of the window height. The red rectangle indicates the union of the visible area of ​​the element before and after the move, i.e. 50% + 25% = 75% of the window, so the impact component is 0.75. And since the unstable element has moved 25% of the height of the window, the value of the distance component is 0.25.