Mask Image, create rectangle from multiple gradients

问题

I have a radial gradient that used as a mask-image "fades" an image in to the background-color behind the image.

mask-image: radial-gradient(ellipse at center, rgba(255,255,255,1) 1%,rgba(255,255,255,1) 50%,rgba(255,255,255,0) 70%,rgba(255,255,255,0) 100%);

How do I get the same effect with an evenly rectangular gradient on all four sides?

I know you can combine gradients and my most current attempt does not seem to have any effect:

img
{
 mask-image: 
  linear-gradient(to top, rgba(255,255,255,1) 1%, rgba(255,255,255,1) 50%),
  linear-gradient(to right, rgba(255,255,255,1) 1%, rgba(255,255,255,1) 50%),
  linear-gradient(to bottom, rgba(255,255,255,1) 1%, rgba(255,255,255,1) 50%),
  linear-gradient(to left, rgba(255,255,255,1) 1%, rgba(255,255,255,1) 50%);
}

回答1:

The trick with multiple mask is to control the size/position so that each one will apply to a region of your element:

.box {
  height:300px;
  width:300px;
  background: url(https://i.picsum.photos/id/1003/300/300.jpg);
  -webkit-mask: 
     linear-gradient(to top,    transparent,#fff) top   /100% 20%,
     linear-gradient(to bottom, transparent,#fff) bottom/100% 20%,
     linear-gradient(to left  , transparent,#fff) left  /20% 100%,
     linear-gradient(to right , transparent,#fff) right /20% 100%;
  -webkit-mask-repeat:no-repeat;
  
  mask: 
     linear-gradient(to top,    transparent,#fff) top   /100% 20%,
     linear-gradient(to bottom, transparent,#fff) bottom/100% 20%,
     linear-gradient(to left  , transparent,#fff) left  /20% 100%,
     linear-gradient(to right , transparent,#fff) right /20% 100%;
  mask-repeat:no-repeat;
}

body {
  background:pink;
}

<div class="box"></div>

Or like this:

.box {
  height:300px;
  width:300px;
  background: url(https://i.picsum.photos/id/1003/300/300.jpg);
  -webkit-mask: 
    linear-gradient(to top,  transparent 10%, #fff 15% 90%, transparent 95%),
    linear-gradient(to left, transparent 10%, #fff 15% 90%, transparent 95%);
  -webkit-mask-size:110% 110%;
  -webkit-mask-position:center;
  -webkit-mask-repeat:no-repeat;
  -webkit-mask-composite: source-in;
  
  
  mask: 
    linear-gradient(to top,  transparent 10%, #fff 15% 90%, transparent 95%),
    linear-gradient(to left, transparent 10%, #fff 15% 90%, transparent 95%);
  mask-size: 110% 110%;
  mask-position: center;
  mask-repeat:no-repeat;
  mask-composite: intersect;
}

body {
  background:pink;
}

<div class="box"></div>

Related: How to make a rectangular transparency gradient CSS3?

来源：https://stackoverflow.com/questions/60574155/mask-image-create-rectangle-from-multiple-gradients