Advanced layout techniques with CSS

As IE8 gradually withdraws from the stage, many advanced CSS features have been natively supported by browsers, and they will become obsolete if they are not learned.

Use

:empty

to distinguish empty elements

兼容性：不支持 IE8

Demo
Suppose we have the above list:
b62caee2527db9e0884616776ccbf4efa94b3e26ee717c64999d7867364b1b4a3
b62caee2527db9e0884616776ccbf4efb94b3e26ee717c64999d7867364b1b4a3
b62caee2527db9e0884616776ccbf4ef94b3e26ee717c64999d7867364b1b4a3
We hope to treat empty elements and non-empty elements differently , then there are two options.
Use

:empty

to select empty elements:
.item:empty {
display: none;
}
Or use

:not(:empty)

Select non-empty elements:
.item:not(:empty) {
border: 1px solid #ccc;
/* ... */
}

Use

:*-Of-Type

to select elements

兼容性：不支持 IE8

Example.
Bold the first p paragraph:
p:first-of-type {
font-weight: bold;
}
Add a border to the last img:
img:last-of-type {
border: 10px solid #ccc;
}
Add a style to the unconnected blockquote:

blockquote:only-of-type {
border-left: 5px solid #ccc;
padding-left: 2em;
}
Let the p paragraph in the odd column die red first:

p:nth-of-type(even) {
color: red;
}
In addition,

:nth-of-type

can also have other types of parameters:

/* an even number*/
:nth-of-type(even)

/* only the third one*/
:nth-of-type(3)

/* Every third */
:nth-of-type(3n)

/* Every fourth plus Three, namely 3, 7, 11, ... */
:nth-of-type(4n+3)

Use

calc

for flow layout

兼容性：不支持 IE8

Demo
Flow layout of left, middle and right:

nav {
position: fixed;
left: 0;
top: 0;
width: 5rem;
height: 100%;
}
aside {
position: fixed;
right: 0;
top: 0;
width: 20rem;
height: 100%;
}

main {
margin-left: 5rem;
width: calc(100% - 25rem);
}

Use

vw

and

vh

to create a full-screen scrolling effect

兼容性：不支持 IE8

Demo

vw

and

vh

are relative to viewport, so they will not change with the content and layout Change with change.

section {
width: 100vw;
height: 100vh;

display: flex;
align-items: center;
justify-content: center;
text-align: center;

background-size: cover;
background-repeat : no-repeat;
background-attachment: fixed;
}

section:nth-of-type(1) {
background-image: url('https://unsplash.it/1024/683?image=1068');
}
section:nth-of-type(2 ) {
background-image: url('https://unsplash.it/1024/683?image=1073');
}
section:nth-of-type(3) {
background-image: url('https://unsplash.it/1024/683?image=1047');
}
section:nth-of-type(4) {
background-image : url('https://unsplash.it/1024/683?image=1032');
}

body {
margin: 0;
}
p {
color: #fff;
font-size: 100px;
font-family: monospace;
}

用 

unset

 做 CSS Reset

兼容性：不支持 IE

Demo

body {
 color: red;
}
button {
 color: white;
 border: 1px solid #ccc;
}

/* 取消 section 中 button 的 color 设置 */
section button {
 color: unset;
}

用 

column

 做响应式的列布局

兼容性：不支持 IE9

Demo

nav {
 column-count: 4;
 column-width: 150px;
 column-gap: 3rem;
 column-rule: 1px dashed #ccc;
 column-fill: auto;
}

h2 {
 column-span: all;
}
(完)

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