html - How to write a CSS selector that works on nested divs and selects the closest match? -

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imagine have dynamically rendered page use classes class1 , class2 on divs contain each other:

<div class="class1">   ...   <div class="class2">     ...     <div class="insider">

i have these selectors in css:

.class1 .insider { ... } .class2 .insider { ... }

now problem both selectors match above .insider , 1 later in css source code win. how can make selector win has classn parent closest .insider.

below snippet reproduced problem, showed expectations inline styles. .other , .another divs there show depth of .insider not known, direct child selector (>) out of picture.

/* layout: irrelevant issue */  .outer {    height: 100px;    width: 100px;  }  .inner {    display: inline-block;    height: 50px;    width: 50px;    margin: 25px 25px;  }  .insider {    text-align: center;  }    /* colors: visual part should fixed */  .class1 {    background-color: black;  }  .class2 {    background-color: lightgray;  }  .class1 .insider {    color: red;  }  .class2 .insider {    color: green;  }
<table>  <tr><th>title</th><th>actual</th><th>expected</th><th>explanation</th></tr>  <tr>  <td>inside class1-2</td>  <td>    <div class="outer class1">      <div class="inner class2">        <div class="other">          <p class="insider">asdf</p>        </div>      </div>    </div>  </td>  <td>    <div class="outer" style="background-color: black;">      <div class="inner" style="background-color: lightgray;">        <div class="other">          <p class="insider" style="color: green;">asdf</p>        </div>      </div>    </div>  </td>  <td>the text color should green because closest styled parent "class2" , not because ".class2 .insider" declared after ".class1 .insider" in css code. swap red , green styles in css , text turns red.</td>  </tr>  <tr>  <td>inside class2-1</td>  <td>    <div class="outer class2">      <div class="inner class1">        <div class="other">          <div class="another">            <p class="insider">asdf</p>          </div>        </div>      </div>    </div>  </td>  <td>    <div class="outer" style="background-color: lightgray;">      <div class="inner" style="background-color: black;">        <div class="other">          <div class="another">            <p class="insider" style="color: red;">asdf</p>          </div>        </div>      </div>    </div>  </td>  <td>the text color should red because closest styled parent "class1".</td>  </tr>  <tr>  <td>inside class2-1-2</td>  <td>    <div class="outer class2">      <div class="inner class1">        <div class="other class2">          <div class="another">            <p class="insider">asdf</p>          </div>        </div>      </div>    </div>  </td>  <td>    <div class="outer" style="background-color: lightgray;">      <div class="inner" style="background-color: black;">        <div class="other" style="background-color: lightgray;">          <div class="another">            <p class="insider" style="color: green;">asdf</p>          </div>        </div>      </div>    </div>  </td>  <td>the text color should green because closest styled parent "class2", , not because outermost styled parent "class2", nor because of declaration order, see first case.</td>  </tr>  </table>

all of examples show in chrome dev tools inspector: enter image description here
it's visible green color wins because has bigger line number.

.class1 .insider, .class2 .class1 .insider{   color: red; } .class2 .insider, .class1 .class2 .insider{   color: green; }

the downside of solution n increase number of selector have write increase recursively. can helped pre-processing library sass or less.

demo:

/* layout: irrelevant issue */  .outer {    height: 100px;    width: 100px;  }  .inner {    display: inline-block;    height: 50px;    width: 50px;    margin: 25px 25px;  }  .insider {    text-align: center;  }    /* colors: visual part should fixed */  .class1 {    background-color: black;  }  .class2 {    background-color: lightgray;  }  .class1 .insider,  .class2 .class1 .insider{    color: red;  }  .class2 .insider,  .class1 .class2 .insider{    color: green;  }
<table>  <tr><th>title</th><th>actual</th><th>expected</th><th>explanation</th></tr>  <tr>  <td>inside class1-2</td>  <td>    <div class="outer class1">      <div class="inner class2">        <div class="other">          <p class="insider">asdf</p>        </div>      </div>    </div>  </td>  <td>    <div class="outer" style="background-color: black;">      <div class="inner" style="background-color: lightgray;">        <div class="other">          <p class="insider" style="color: green;">asdf</p>        </div>      </div>    </div>  </td>  <td>the text color should green because closest styled parent "class2" , not because ".class2 .insider" declared after ".class1 .insider" in css code. swap red , green styles in css , text turns red.</td>  </tr>  <tr>  <td>inside class2-1</td>  <td>    <div class="outer class2">      <div class="inner class1">        <div class="other">          <div class="another">            <p class="insider">asdf</p>          </div>        </div>      </div>    </div>  </td>  <td>    <div class="outer" style="background-color: lightgray;">      <div class="inner" style="background-color: black;">        <div class="other">          <div class="another">            <p class="insider" style="color: red;">asdf</p>          </div>        </div>      </div>    </div>  </td>  <td>the text color should red because closest styled parent "class1".</td>  </tr>  <tr>  <td>inside class2-1-2</td>  <td>    <div class="outer class2">      <div class="inner class1">        <div class="other class2">          <div class="another">            <p class="insider">asdf</p>          </div>        </div>      </div>    </div>  </td>  <td>    <div class="outer" style="background-color: lightgray;">      <div class="inner" style="background-color: black;">        <div class="other" style="background-color: lightgray;">          <div class="another">            <p class="insider" style="color: green;">asdf</p>          </div>        </div>      </div>    </div>  </td>  <td>the text color should green because closest styled parent "class2", , not because outermost styled parent "class2", nor because of declaration order, see first case.</td>  </tr>  </table>

edit n-independent version in need add selectors if nested html layout more complex:

.unique_class_name1 .insider, [class~=unique_class_name] .unique_class_name1 .insider{   color: red; } .unique_class_name2 .insider, [class~=unique_class_name] .unique_class_name2 .insider{   color: green; }

in version though, important make sure pattern unique_class_name unique, since class~=unique_class_name hit elements class attribute contains key.

/* layout: irrelevant issue */  .outer {    height: 100px;    width: 100px;  }  .inner {    display: inline-block;    height: 50px;    width: 50px;    margin: 25px 25px;  }  .insider {    text-align: center;  }    /* colors: visual part should fixed */  .unique_class_name1 {    background-color: black;  }  .unique_class_name2 {    background-color: lightgray;  }  .unique_class_name1 .insider,  [class~=unique_class_name] .unique_class_name1 .insider{    color: red;  }  .unique_class_name2 .insider,  [class~=unique_class_name] .unique_class_name2 .insider{    color: green;  }
<table>  <tr><th>title</th><th>actual</th><th>expected</th><th>explanation</th></tr>  <tr>  <td>inside class1-2</td>  <td>    <div class="outer unique_class_name1">      <div class="inner unique_class_name2">        <div class="other">          <p class="insider">asdf</p>        </div>      </div>    </div>  </td>  <td>    <div class="outer" style="background-color: black;">      <div class="inner" style="background-color: lightgray;">        <div class="other">          <p class="insider" style="color: green;">asdf</p>        </div>      </div>    </div>  </td>  <td>the text color should green because closest styled parent "class2" , not because ".class2 .insider" declared after ".class1 .insider" in css code. swap red , green styles in css , text turns red.</td>  </tr>  <tr>  <td>inside class2-1</td>  <td>    <div class="outer unique_class_name2">      <div class="inner unique_class_name1">        <div class="other">          <div class="another">            <p class="insider">asdf</p>          </div>        </div>      </div>    </div>  </td>  <td>    <div class="outer" style="background-color: lightgray;">      <div class="inner" style="background-color: black;">        <div class="other">          <div class="another">            <p class="insider" style="color: red;">asdf</p>          </div>        </div>      </div>    </div>  </td>  <td>the text color should red because closest styled parent "class1".</td>  </tr>  <tr>  <td>inside class2-1-2</td>  <td>    <div class="outer unique_class_name2">      <div class="inner unique_class_name1">        <div class="other unique_class_name2">          <div class="another">            <p class="insider">asdf</p>          </div>        </div>      </div>    </div>  </td>  <td>    <div class="outer" style="background-color: lightgray;">      <div class="inner" style="background-color: black;">        <div class="other" style="background-color: lightgray;">          <div class="another">            <p class="insider" style="color: green;">asdf</p>          </div>        </div>      </div>    </div>  </td>  <td>the text color should green because closest styled parent "class2", , not because outermost styled parent "class2", nor because of declaration order, see first case.</td>  </tr>  </table>


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