CSS and determining the size of the displayed area

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If the image size is not specified, the browser cannot determine the appropriate table area for the image, so it may push aside the text and display a large image. If you specify the image size in advance, you can load text data while reserving the display area for the image, preventing layout disruptions. You can also fix the aspect ratio with CSS. By fixing the image aspect ratio for each window size in advance with , you can prevent layout collapse even in responsive designs.


Optimize your ad space Banner ads come in a variety switzerland telegram phone number list of sizes, which can cause unintended disruptions to the layout. Therefore, just like with images, you need to specify the display area for ads in advance. Note that the display area for ads should be set in a way that does not affect the layout, such as by causing the space to disappear even if the ad is not delivered. Also, if possible, try to avoid placing ads at the top of the page.


If an ad displayed at the top of the page disrupts the layout, the layout of the entire page will be disrupted, which will increase the CLS score. If you want to place an ad display area at the top of a page, please specify an area with ample space. Minimize the use of web fonts The FOUT mechanism, which displays alternative fonts while a web font is loading, can sometimes disrupt the layout. Additionally, a phenomenon known as FOIT (Flash of Invisible Text), in which text is not displayed until the web font is loaded, can also disrupt the layout.