justify-items
CSS 的 justify-items
属性为所有盒中的项目定义了默认的 justify-self
,可以使这些项目以默认方式沿适当轴线对齐到每个盒子。
尝试一下
语法规则
/* Basic keywords */
justify-items: auto;
justify-items: normal;
justify-items: stretch;
/* Positional alignment */
justify-items: center; /* Pack items around the center */
justify-items: start; /* Pack items from the start */
justify-items: end; /* Pack items from the end */
justify-items: flex-start; /* Pack flex items from the start */
justify-items: flex-end; /* Pack flex items from the end */
justify-items: self-start;
justify-items: self-end;
justify-items: left; /* Pack items from the left */
justify-items: right; /* Pack items from the right */
/* Baseline alignment */
justify-items: baseline;
justify-items: first baseline;
justify-items: last baseline;
/* Overflow alignment (for positional alignment only) */
justify-items: safe center;
justify-items: unsafe center;
/* Legacy alignment */
justify-items: legacy right;
justify-items: legacy left;
justify-items: legacy center;
/* Global values */
justify-items: inherit;
justify-items: initial;
justify-items: unset;
此属性可以采用四种不同的形式之一:
- 关键词:关键字
normal
,auto
,或stretch
任选其一 - 基线对齐:关键词
baseline
,可选first
或last
之一为前缀 - 位置对其:关键词
center
,start
,end
,flex-start
,flex-end
,self-start
,self-end
,left
或right
任选其一,可选safe
或unsafe
之一为前缀 - Legacy alignment: the
legacy
keyword, followed by one ofleft
orright
.
值
auto
-
使用的值是父元素的 justify-items 属性的值,除非该方框没有父元素,或者是绝对定位的,在这些情况下,
auto
代表normal
。 normal
-
这个关键字的效果取决于我们所处的布局模式:
- 在块级布局中,相当于是
start
。 - In absolutely-positioned layouts, the keyword behaved like
start
on replaced absolutely-positioned boxes, and asstretch
on all other absolutely-positioned boxes. - In table cell layouts, this keyword has no meaning as this property is ignored.
- In flexbox layouts, this keyword has no meaning as this property is ignored.
- In grid layouts, this keyword leads to a behavior similar to the one of
stretch
, except for boxes with an aspect ratio or an intrinsic sizes where it behaves likestart
.
- 在块级布局中,相当于是
start
-
The item is packed flush to each other toward the start edge of the alignment container in the appropriate axis.
end
-
The item is packed flush to each other toward the end edge of the alignment container in the appropriate axis.
flex-start
-
For items that are not children of a flex container, this value is treated like
start
. flex-end
-
For items that are not children of a flex container, this value is treated like
end
. self-start
-
The item is packed flush to the edge of the alignment container of the start side of the item, in the appropriate axis.
self-end
-
The item is packed flush to the edge of the alignment container of the end side of the item, in the appropriate axis.
center
-
The items are packed flush to each other toward the center of the of the alignment container.
left
-
The items are packed flush to each other toward the left edge of the alignment container. If the property’s axis is not parallel with the inline axis, this value behaves like
start
. right
-
The items are packed flush to each other toward the right edge of the alignment container in the appropriate axis. If the property’s axis is not parallel with the inline axis, this value behaves like
start
. -
baseline first baseline
last baseline
-
Specifies participation in first- or last-baseline alignment: aligns the alignment baseline of the box’s first or last baseline set with the corresponding baseline in the shared first or last baseline set of all the boxes in its baseline-sharing group. The fallback alignment for
first baseline
isstart
, the one forlast baseline
isend
. stretch
-
If the combined size of the items is less than the size of the alignment container, any
auto
-sized items have their size increased equally (not proportionally), while still respecting the constraints imposed bymax-height
/max-width
(or equivalent functionality), so that the combined size exactly fills the alignment container. safe
-
If the size of the item overflows the alignment container, the item is instead aligned as if the alignment mode were
start
. unsafe
-
Regardless of the relative sizes of the item and alignment container, the given alignment value is honored.
legacy
-
Makes the value inherited by the box descendants. Note that if a descendant has a
justify-self: auto
value, thelegacy
keyword is not considered by the descend, only theleft
,right
, orcenter
value associated to it.
Formal syntax
justify-items =
normal |
stretch |
<baseline-position> |
<overflow-position>? [ <self-position> | left | right ] |
legacy |
legacy && [ left | right | center ] |
anchor-center
<baseline-position> =
[ first | last ]? &&
baseline
<overflow-position> =
unsafe |
safe
<self-position> =
center |
start |
end |
self-start |
self-end |
flex-start |
flex-end
规范
Specification |
---|
CSS Box Alignment Module Level 3 # justify-items-property |
浏览器兼容性
BCD tables only load in the browser
参见
- CSS Grid Guide: Box alignment in CSS Grid layouts
- CSS Box Alignment
- The
place-items
shorthand property - The
justify-self
property - The
align-items
property