Choosing what units to adapt to different screen sizes is a best practice for responsive layouts

What units should be used for responsive layout to adapt to different screen sizes?

In today's era of widespread mobile devices, web developers are faced with an important problem: how to make web pages render well on different screen sizes.

In order to solve this problem, responsive layout (Responsive Design) came into being. Responsive design is a web design method that automatically adapts to different screen sizes and resolutions. It can automatically adjust the layout and layout of web pages according to the screen size and orientation of the device, so that it can have a good user experience on different screens.

In responsive layouts, choosing the right units to adapt to different screen sizes is crucial. Below are some common units to choose from.

1. Percent (%): Percent is one of the most common responsive layout units. By setting the percentage values ​​of the element's width, height, margins and other attributes, you can adjust its size according to the size of the parent element. For example, if you set the width of an element to 50%, the width of the element will be half the width of the parent element, regardless of the width of the parent element. Percent units are suitable for resizing relative to the size of the parent element.
2. Adaptive units (vw, vh): Adaptive units are units that are adjusted relative to the width and height of the viewport. The viewport refers to the visible area of ​​the browser window or device screen. The vw unit represents a percentage of the viewport width, and the vh unit represents a percentage of the viewport height. For example, setting the width of an element to 50vw will make the element's width half the width of the viewport. Adaptive units are suitable for situations where they adjust to the size of the device screen.
3. Flexible unit (rem, em): Flexible unit is a unit that is adjusted relative to the font size of the element's root element or parent element. The rem unit represents the font size relative to the root element (usually the element), and the em unit represents the font size relative to the parent element. By setting the font size of the element to rem units, the element can be resized as the font size of the root element changes, thereby achieving a responsive layout. When using flex units, you need to choose the reference elements carefully to avoid accidental resizing.

In addition to the above units, there are other units that can be used for responsive layout, such as pixels (px), media queries, etc. Different units are suitable for different scenarios, and developers can choose and combine them according to specific situations.

In general, responsive layouts should use appropriate units to adapt to different screen sizes. Choosing the right units can help developers achieve flexible and adaptive layout effects, improve user experience, and enable web pages to render well on different devices.

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