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CSS Elector stili, seligendi html elementa in pagina ad stylos CSS adde.

Sort reddendo perficientur ab alto ad low Sequitur:

ID Elector #id

Select elementis suis id attributum, sensitivo

<p id="p1" >第一段</p>
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#p1{
  color: red;
}
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Sed usus eius non commendatur quia;

• Id selector altiorem prioritatem habet et incommodum est ut stylum retexere.
• Quod id maxime usus est lego per JS *

genus electrix .class

Per attributum elementum est scriptorstyleClassis nomen elementum delectae est causa sensitiva

Maxime commendatur CSS electrix illa classis selectores sunt semantically fortes et faciles ad genera reset.

<span class="important" >重点词汇</span>
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.important{
  color: red;
  font-weight: bold;
}
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Classes styli multiplices eidem elemento separato per spatia addi possunt.

<span class="important big" >巨大的重点词汇</span>
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.important {
  color: red;
  font-weight: bold;
}
.big {
  font-size: 60px;
}
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tag electrix 标签名

Selecta elementa ex nominibus tag eorum, insensibili casu-

<a href="https://www.baidu.com/" target="_blank" >百度</a>
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a {
  text-decoration: none; /* 无文本装饰（消除默认的下划线） */
}
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Non commendatae ob egestatem tag electrix perficiendi et alta sustentationem gratuita

wildcard electrix *

Omnia elementa HTML in pagina selecta praeter pseudo elementa.

/* 清除所有html标签默认的外边距和内边距 */
* {
  margin: 0;
  padding: 0;
}
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attributum electrix [属性]

Elementa selecta ex suis attributis et valoribus attributis non sunt.

Pseudo genus electrix :状态名

Select elementis fundatur in civitatibus diversis

同一个标签，不同的状态，有不同的样式，就叫做“伪类”
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Utere pseudo-genus selectores in lists

n significat 0,1,2,3,4,5,6,7,8... (Irritum est cum n minus est quam I, quia n = 0 non est electus)

Utere pseudo-genus selectores in tabulis

• tr:nth-child(odd)：De paribus versuum 1, 3, et 5, tabulae, quae aequivalettr:nth-child(2n+1)。
• tr:nth-child(even): Matches ordines 2, 4, et 6, tabulae, quae aequivalettr:nth-child(2n)。

• Exemplum practicum pseudo-classis electoris

  • Usus: nth-puer() ad efficiendum livorem zebra, ora alignment, determinatum album range elucidandum, et album dynamicum propositum adaptivum
    https://blog.csdn.net/weixin_41192489/article/details/122089484

  • CSS instrumenta dynamica ostentationis et latebrae (mirabilis usus: repressit et: scopum)
    https://blog.csdn.net/weixin_41192489/article/details/126267866

  • Utere: scopum augere, concidere, tab commutationehttps://blog.csdn.net/weixin_41192489/article/details/121969768

  • Usus: placeholder-designando consequi style commercium MaterialDesign
    https://blog.csdn.net/weixin_41192489/article/details/121976627

  • Usus: placeholder-exhibitus ad comprobandum nullius pretii, promptus non potest esse vacuus
    https://blog.csdn.net/weixin_41192489/article/details/121977510

  • : Repressit utensilia expansionem et ruina
    https://demo.cssworld.cn/selector/9/2-1.php

  • : Sedatus vasa tab commutatione
    https://demo.cssworld.cn/selector/9/2-2.php

  • : Instrumenta consuetudinis bullarum radiophonicae repressit, scriniorum sistendorum, permutationum, pittacium, et materialium electionum radiophonicae
    https://blog.csdn.net/weixin_41192489/article/details/122050069

  • Utere: validum et: irritum ad efficiendum patria forma sanatio
    https://blog.csdn.net/weixin_41192489/article/details/122070084

  • Usus, requiritur et: libitum ad effectum deducendi forma verificationem promptum illud
    https://blog.csdn.net/weixin_41192489/article/details/122072879

  • : Focus-in instrumentis gutta-down list
    https://blog.csdn.net/weixin_41192489/article/details/121959850

  • Cum arca inputationis feruntur, pittacium in fronte exaggerare (vide modum 5 in nexu)
    https://blog.csdn.net/weixin_41192489/article/details/121784196

  • Mus volitans ad imaginem amplificatam propono vs click murem ad imaginem amplificatam propono
    https://blog.csdn.net/weixin_41192489/article/details/121944791

  • : Vana celat inanibus elementis et absentis agris dolor tips
    https://blog.csdn.net/weixin_41192489/article/details/122086159

  • Unigenitus instrumentum multi-statum dynamica loading animatio
    https://blog.csdn.net/weixin_41192489/article/details/122088416

  • : Fullscreen dat plena screen ostentationem clicked imagines
    https://blog.csdn.net/weixin_41192489/article/details/122328725

  Pseudo elementum electrix ::

  Deligere et styli partem elementum, quam elementum integer

  CSS2中伪元素采用单冒号前缀语法， CSS2.1中伪元素改用双冒号前缀，所有支持双冒号的浏览器同样也支持旧的单冒号语法。考虑浏览器兼容性的话，推荐使用旧的单冒号语法，否则建议使用新的双冒号前缀
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  ::before et::after

  Utendum est una cum attributo contento ante et post elementum
  https://blog.csdn.net/weixin_41192489/article/details/115100040

  Communiter exempla practica:

  • Add icones ante et post elementa (magica :: ante et ::post)
    https://blog.csdn.net/weixin_41192489/article/details/134858462
  • CSS callide utitur :: post et :: ante ad efficiendum verticali categoriae navigationis
    https://blog.csdn.net/weixin_41192489/article/details/134885007
  • css callide utitur :: cum ad consequi tab commutatione animationem
    https://blog.csdn.net/weixin_41192489/article/details/134881852

  ::first-letter Initials

  <p>很久很久以前</p>
  <p>Long long ago</p>
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  p::first-letter {
    font-size: 2em;
    color: red;
  }
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  ::first-line primo versu

    <div style="width: 120px">
      <p>很久很久以前，有一个白发苍苍的老人</p>
    </div>
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  p::first-line {
    color: red;
  }
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  ::selection Trahunt mus eligere aream

  <p>很久很久以前，有一个白发苍苍的老人</p>
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  p::selection {
    color: red;
    background-color: yellow;
  }
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  ::placeholder text placeholder

  <input placeholder="请输入" />
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  /* input 不写，则会选中页面所有元素的占位符 */
  input::placeholder {
    color: red;
  }
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  Relatione electrix

  Select elementis secundum relationes inter elementa

  descendens electrix >

  Primi gradus tag involutus intra tag est de semine eius

  <div>
      <p>我是div的儿子</p>
  </div>
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  div>p{
    color:red;
  }
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  descendens electrix 空格

  Omnes tags intra tag sunt posteri eius

    <div class="parent">
      <p class="red">我是子代（属于后代）</p>
      <p>我是子代（属于后代，但没有 .red）</p>
      <div>
        <div class="red">我是孙代（也属于后代）</div>
      </div>
    </div>
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  /* 所有属于.parent元素内部的.red元素都将被染成红色。*/
  .parent .red {
    color: red;
  }
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  fratrem electrix ~

  Sub eodem parente elementum certum elementum eligerepostOmnia elementa aequo, proprie loquendo, dici debent 后面兄弟选择器

  <div>
    <button>按钮1(不会变红)</button>
    <p>段落</p>
    <button>按钮2（会变红）</button>
  </div>
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  p ~ button {
    color: red;
  }
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  CSS no 前面兄弟选择器 , referre potes ad inferiorem vinculum ad exsecutionem simulare
  https://blog.csdn.net/weixin_41192489/article/details/121784196

  proximum fratrem electrix +

  Eligit elementum proximum sequentem elementum

    <div class="parent">
      <p>段落</p>
      <button>按钮1</button>
      <button>按钮2</button>
    </div>
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  p + button {
    color: red;
  }
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  Intersectio electrix

  Elementa selecta in pagina quae pluribus selectoribus simul congruit

  • Nulla spatia inter selectores (spatia sunt abneptis selectoribus)
  • Si tag selector existat, tag electrix praeponi debet

      <p class="red">很久很久以前1</p>
      <p>很久很久以前2</p>
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  /* 选中 p 标签中class值含 red 的元素 */
  p.red {
    color: red;
  }
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  Unionis electrix ,

  Inter selectores multiplices, dum unus ex illis satisfecerit, eligendus erit.

  • Inter plures usus selectores , separatum

   <p class="error">报错信息</p>
   <p class="important">重要信息</p>
   <p>其他信息</p>
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  .error,
  .important {
    color: red;
  }
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