The black technology here is actually some properties in CSS that are not well known but are very useful in solving certain problems.
border-radius
Many developers probably don’t understand this border-radius correctly, because basically many people use it like this:
.box { border-radius: 4px; }
The slightly more high-end one is like this:
.box { border-radius: 4px 6px 6px 4px; }
However, the ultimate black technology This is how it is used:
.box { border-radius: 5px 5px 3px 2px / 5px 5px 1px 3px; }
Yes, it can be assigned 8 values. Have you never seen it? Don’t worry, the specific explanation is as follows:
The one before the slash affects the horizontal direction, and the one behind the slash affects the vertical direction. Each number represents four different directions.
outline-offset
I believe many developers will be familiar with the following statement when writing CSS:
input { outline : none; } input:focus { outline : none; }
This is how to remove the default blue line frame from the input input box. In fact, another thing to mention here is that there is an outline-offset attribute in CSS. In this attribute, you can set the distance of the default wireframe; like this
input { outline-offset: 4px ; }
You can see the outline by adjusting the value of this attribute. The distance has changed.
Class declaration
You may all be familiar with the following class declaration:
.col-8 { }
Of course it’s nothing, but if you write it like this:
.♥ { color: hotpink; } .★ { color: yellow; }
Well, how does it look? You can use it like this :
<div class="♥ ★"></div>
As long as it is Unicode, you can declare your class like this.
Select several consecutive elements
ol li:nth-child(n+7):nth-child(-n+14) { background: lightpink; } /** Or Safari Way **/ ol li:nth-child(-n+14):nth-child(n+7) { background: lightpink; }
The above writing method can actually select the seventh to fourteenth li elements below ol.
Pseudo-class setting single tag
There are several common single tags in HTML:
,
etc.
The following example is to modify
.
hr:before { content: "♪♪"; } hr:after { content: " This is an <hr> element"; }
That’s right, the key is to use the two pseudo-classes: before and :after. Here, by the way, you can actually use these two pseudo-classes to modify and , but the premise is that you set the display attributes of these two to:
display: block
attribute Case sensitive
If we have code similar to the following when writing html:
<div class="box"></div> <input type="email">
Then we use attribute selectors for CSS modification:
div[class="box"] { color: blue; } input[type="email"] { border: solid 1px red; }
Such a declaration method will undoubtedly take effect. However, if we declare it like this, what will the result be like:
div[class="box"] { color: blue; } input[type="email"] { border: solid 1px red; }
After this becomes uppercase, the first class="BOX" will not affect the

在css中,可用list-style-type属性来去掉ul的圆点标记,语法为“ul{list-style-type:none}”;list-style-type属性可设置列表项标记的类型,当值为“none”可不定义标记,也可去除已有标记。

区别是:css是层叠样式表单,是将样式信息与网页内容分离的一种标记语言,主要用来设计网页的样式,还可以对网页各元素进行格式化;xml是可扩展标记语言,是一种数据存储语言,用于使用简单的标记描述数据,将文档分成许多部件并对这些部件加以标识。

在css中,可以利用cursor属性实现鼠标隐藏效果,该属性用于定义鼠标指针放在一个元素边界范围内时所用的光标形状,当属性值设置为none时,就可以实现鼠标隐藏效果,语法为“元素{cursor:none}”。

转换方法:1、给英文元素添加“text-transform: uppercase;”样式,可将所有的英文字母都变成大写;2、给英文元素添加“text-transform:capitalize;”样式,可将英文文本中每个单词的首字母变为大写。

在css中,rtl是“right-to-left”的缩写,是从右往左的意思,指的是内联内容从右往左依次排布,是direction属性的一个属性值;该属性规定了文本的方向和书写方向,语法为“元素{direction:rtl}”。

在css中,可以利用“font-style”属性设置i元素不是斜体样式,该属性用于指定文本的字体样式,当属性值设置为“normal”时,会显示元素的标准字体样式,语法为“i元素{font-style:normal}”。

在css3中,可以用“transform-origin”属性设置rotate的旋转中心点,该属性可更改转换元素的位置,第一个参数设置x轴的旋转位置,第二个参数设置y轴旋转位置,语法为“transform-origin:x轴位置 y轴位置”。


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