The problem of 1 pixel border on the mobile terminal

Mobile 1 Pixel border problem

----- If the screen resolution of our mobile phone is relatively high , It's a double screen or triple screen , If we write on the page border-bottom: 1px; What we write at this time is 1px, But it's actually css Pixels , Not physical pixels , If we watch carefully , On a double or triple screen, it's not actually 1 Individual physical pixels , It's the height of two physical pixels or three pixels , In order to solve the problem of multiple screen 1 The problem that pixel borders will be displayed as multi-pixel borders , Need to introduce a solution , This scheme is a css file

Here's this css Source code of the document

@charset "utf-8";
.border, .border-top, .border-right, .border-bottom, .border-left, .border-topbottom, .border-rightleft, .border-topleft, .border-rightbottom, .border-topright, .border-bottomleft {
    
    position: relative;
}
.border::before, .border-top::before, .border-right::before, .border-bottom::before, .border-left::before, .border-topbottom::before, .border-topbottom::after, .border-rightleft::before, .border-rightleft::after, .border-topleft::before, .border-topleft::after, .border-rightbottom::before, .border-rightbottom::after, .border-topright::before, .border-topright::after, .border-bottomleft::before, .border-bottomleft::after {
    
    content: "\0020";
    overflow: hidden;
    position: absolute;
}
/* border *  because , The border is covered by a pseudo element area at the parent level  *  so , If there is interaction between children , You need to set up  *  location   And  z Axis  */
.border::before {
    
    box-sizing: border-box;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    border: 1px solid #eaeaea;
    transform-origin: 0 0;
}
.border-top::before, .border-bottom::before, .border-topbottom::before, .border-topbottom::after, .border-topleft::before, .border-rightbottom::after, .border-topright::before, .border-bottomleft::before {
    
    left: 0;
    width: 100%;
    height: 1px;
}
.border-right::before, .border-left::before, .border-rightleft::before, .border-rightleft::after, .border-topleft::after, .border-rightbottom::before, .border-topright::after, .border-bottomleft::after {
    
    top: 0;
    width: 1px;
    height: 100%;
}
.border-top::before, .border-topbottom::before, .border-topleft::before, .border-topright::before {
    
    border-top: 1px solid #eaeaea;
    transform-origin: 0 0;
}
.border-right::before, .border-rightbottom::before, .border-rightleft::before, .border-topright::after {
    
    border-right: 1px solid #eaeaea;
    transform-origin: 100% 0;
}
.border-bottom::before, .border-topbottom::after, .border-rightbottom::after, .border-bottomleft::before {
    
    border-bottom: 1px solid #eaeaea;
    transform-origin: 0 100%;
}
.border-left::before, .border-topleft::after, .border-rightleft::after, .border-bottomleft::after {
    
    border-left: 1px solid #eaeaea;
    transform-origin: 0 0;
}
.border-top::before, .border-topbottom::before, .border-topleft::before, .border-topright::before {
    
    top: 0;
}
.border-right::before, .border-rightleft::after, .border-rightbottom::before, .border-topright::after {
    
    right: 0;
}
.border-bottom::before, .border-topbottom::after, .border-rightbottom::after, .border-bottomleft::after {
    
    bottom: 0;
}
.border-left::before, .border-rightleft::before, .border-topleft::after, .border-bottomleft::before {
    
    left: 0;
}
@media (max--moz-device-pixel-ratio: 1.49), (-webkit-max-device-pixel-ratio: 1.49), (max-device-pixel-ratio: 1.49), (max-resolution: 143dpi), (max-resolution: 1.49dppx) {
    
    /*  The default value is , No need to reset  */
}
@media (min--moz-device-pixel-ratio: 1.5) and (max--moz-device-pixel-ratio: 2.49), (-webkit-min-device-pixel-ratio: 1.5) and (-webkit-max-device-pixel-ratio: 2.49), (min-device-pixel-ratio: 1.5) and (max-device-pixel-ratio: 2.49), (min-resolution: 144dpi) and (max-resolution: 239dpi), (min-resolution: 1.5dppx) and (max-resolution: 2.49dppx) {
    
    .border::before {
    
        width: 200%;
        height: 200%;
        transform: scale(.5);
    }
    .border-top::before, .border-bottom::before, .border-topbottom::before, .border-topbottom::after, .border-topleft::before, .border-rightbottom::after, .border-topright::before, .border-bottomleft::before {
    
        transform: scaleY(.5);
    }
    .border-right::before, .border-left::before, .border-rightleft::before, .border-rightleft::after, .border-topleft::after, .border-rightbottom::before, .border-topright::after, .border-bottomleft::after {
    
        transform: scaleX(.5);
    }
}
@media (min--moz-device-pixel-ratio: 2.5), (-webkit-min-device-pixel-ratio: 2.5), (min-device-pixel-ratio: 2.5), (min-resolution: 240dpi), (min-resolution: 2.5dppx) {
    
    .border::before {
    
        width: 300%;
        height: 300%;
        transform: scale(.33333);
    }
    .border-top::before, .border-bottom::before, .border-topbottom::before, .border-topbottom::after, .border-topleft::before, .border-rightbottom::after, .border-topright::before, .border-bottomleft::before {
    
        transform: scaleY(.33333);
    }
    .border-right::before, .border-left::before, .border-rightleft::before, .border-rightleft::after, .border-topleft::after, .border-rightbottom::before, .border-topright::after, .border-bottomleft::after {
    
        transform: scaleX(.33333);
    }
}

notes ：

I have also shared some small problems and solutions encountered in the development of mobile terminals before , If you are interested, you can go and have a look , Link address attached
Click here , More surprises ！ Thank you guys