How to make a 0.5 pixel line in css
This time I will show you how to make a 0.5 pixel line with css. What are the precautions for making a 0.5 pixel line with css? The following is a practical case, let’s take a look.
The company’s designers use iPhone 6 (width is 750 physical pixels) as the benchmark when making design drawings. The device pixel ratio of iPhone 6 (that is, the ratio of CSS pixels to physical pixels) is 2, so when the designer designs a box with a border of 1px, it is 0.5 pixels relative to the CSS code. For this problem, the most intuitive way is to directly set the border to 0.5px with css. After testing, the iPhone can display it normally. CSS3 has a zoom attribute. We can use this attribute to reduce the 1px border by 50% to achieve this function. The specific implementation code is as follows
<p class="border3"> <p class="content">伪类设置的边框</p> </p>css:
.border3{
position: relative;
}
.border3:before{
content: '';
position: absolute;
width: 200%;
height: 200%;
border: 1px solid red;
-webkit-transform-origin: 0 0;
-moz-transform-origin: 0 0;
-ms-transform-origin: 0 0;
-o-transform-origin: 0 0;
transform-origin: 0 0;
-webkit-transform: scale(0.5, 0.5);
-ms-transform: scale(0.5, 0.5);
-o-transform: scale(0.5, 0.5);
transform: scale(0.5, 0.5);
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}Implementation ideas:1. Set the reference position of the target element2. Add a pseudo element before or after to the target element. And set 3. Add a 1px border to the pseudo element4. Use the box-sizing: border-box attribute to wrap the border into the width and height Inside5, set the width and height to 200%6, reduce the entire box model to 0.5
7, adjust the position of the box model, Taking the upper left corner as the benchmark transform-origin: 0 0;The implementation result is displayed on the iPhone as follows:
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