Comparison of CSS shadow effects: drop-Shadow and box-Shadow

Drop-shadow and box-shadow are both CSS properties for shadow effects (halo effects). The biggest difference between the two is that box-shadow can only create rectangular shadows, while drop-shadow can create shadows of exactly the same shape as the opaque area of ​​the object. Here are the usage of two CSS properties:

.drop-shadow {
    -webkit-filter: drop-shadow(12px 12px 7px rgba(0, 0, 0, 0.7));
    filter: drop-shadow(12px 12px 7px rgba(0, 0, 0, 0.7))
}

.box-shadow {
    box-shadow: 12px 12px 7px rgba(0, 0, 0, 0.7);
}

Because both are shadow effects (halo effects), the parameters (values) that can be set for the two are almost the same: Taking the example above, all the parameter values ​​represent from left to right: horizontal offset, vertical offset, shadow blur distance, shadow color.

Next, we will further compare drop-shadow and box-shadow for you

Border and Transform Effects

The shadows of drop-shadow and box-shadow can both reflect the rounded corners and deformation effects of the border. The difference is: drop-shadow reflects the shape of the actual border, a solid frame has a solid shadow, and a dotted frame has a dotted shadow; box-shadow treats the border and the content inside as a complete square and creates a shadow of the entire square, while the border style will be ignored and it is directly treated as a solid frame.

.box {
    border: 5px solid #262b57;
    width: 120px;
    height: 120px;
    border-radius: 10px;
    transform: rotate(15deg);
    font-size: 40px;
    text-align: center;
    line-height: 120px;
}

.dashed {
    border-style: dashed;
}

Background and transparency

If the box has a set color (not transparent), the shadow effects of drop-shadow and box-shadow will look similar. What if the background of the block is semi-transparent? We can see from the picture that the color around the shadow is darker and the color in the middle is lighter, so we can infer that transparency will affect drop-shadow but not box-shadow.

.bk {
    background-color: #ffcc66;
}

.bk-alpha {
    background-color: rgba(255, 204, 102, 0.3);
}

Image border

From the example, we know that drop-shadow can reflect the irregular shape of image-border, while box-shadow treats the border directly as a solid frame and ignores the shape of the border image. The owl in the picture is a transparent PNG file. The drop-shadow not only reflects the shape of the border image, but also the shape of the owl inside the border. The box-shadow adheres to the consistent principle and treats the border and the picture as a complete square.

.frame {
    width: 286px;
    height: 240px;
    -moz-border-image: url(frame_green_.png) 25 25 repeat;
    -webkit-border-image: url(frame_green_.png) 25 25 repeat;
    border-width: 25px;
    border-image: url(frame_green_.png) 25 25 repeat;
    border-color: #79b218;
    border-style: inset;
    border-width: 25px;
    box-sizing: border-box;
    display: block;
    margin: 10px;
}

Pseudo-elements

The pseudo-element drop-shadow can reflect the shape of the pseudo-element, while the box-shadow will ignore the pseudo-element.

.addition {
    width: 100px;
    height: 100px;
    background-color: #ffcc66;
    margin: 10px 60px;
    position: relative;
    display: inline-block;
}

.addition:before {
    width: 50px;
    height: 50px;
    background-color: #ff8833;
    content: '';
    display: block;
    position: absolute;
    left: 0;
    top: 50%;
    margin-left: -40px;
    transform: rotate(45deg);
    margin-top: -10px;
}

.addition:after {
    width: 60px;
    height: 60px;
    background-color: #ff8833;
    margin: 10px;
    content: '';
    display: block;
    transform: rotate(20deg);
    transform: skew(20deg, 20deg);
    top: 5px;
    right: -40px;
    position: absolute;
}

Small blocks within a block

The shadow of drop-shadow can reflect the shape of all elements in the block, while box-shadow directly reflects the rectangular shadow of the block.

.square {
    width: 50px;
    height: 50px;
    display: inline-block;
    background-color: #ffcc66;
    margin: 20px;
}
.circle {
    width: 50px;
    height: 50px;
    display: inline-block;
    border-radius: 50%;
    background-color: #ff8833;
    margin: 20px;
}

<div class="demo-wrap">
    <div class="drop-shadow">
        <span class="square"></span>
        <span class="circle"></span>
        <p>drop-shadow</p>
    </div>
    <div class="box-shadow">
        <span class="square"></span>
        <span class="circle"></span>
        <p>box-shadow</p>
    </div>
</div>

Differences between drop-shadow and box-shadow

Drop-shadow does not have the internal border (inset shadow) and distance (spread) characteristics. As far as support is concerned, IE currently does not support the drop-shadow property; while all browsers generally support box-shadow.

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