javascript - width: 100% is not working on children div if parent div has width: calc(100% - 300px)? -


i have following arrangement: have parent div class container width: 100%; , both html , body have width: 100%, , far working expected. inside div class container, have 2 divs, 1 div width: 300px, , other div width: calc(100% - 300px),

where parent class mainpage has width: calc(100% - 300px), , child div class page has width: 100%; width: 100% not working on div?

even though parent div width determinant.

code: https://jsfiddle.net/tj8k0nnw/1/

.container {    width: 100%;    background-color: #d5d5d5;  }    .sidebarcontainer {    width: 300px;    height: 2000px;    display: inline-block;    box-sizing: border-box;    padding: 5px;    padding-right: 2px;  }    .innersidebarcontainer {    position: relative;    width: 100%;    height: 100%;  }    .sidebar {    width: 293px;    background-color: white;    height: 700px;    top: 1px;    position: absolute;  }    .mainpage {    width: calc(100% - 300px);    padding: 5px;    padding-right: 2px;    height: 3000px;    display: inline-block;    box-sizing: border-box;    background-color: teal;  }    .page {    width: 100%;    width: 100%;    background-color: white;  }    .footer {    height: 500px;    width: 100%;    margin: 0 auto;    background-color: purple  }    .test1 {    background-color: red;    position: absolute;    left: 0;    right: 0;    top: 0;    height: 200px;  }    .test2 {    background-color: red;    position: absolute;    left: 0;    right: 0;    bottom: 0;    height: 200px;  }
<div class="container">    <div class="sidebarcontainer">      <div class="innersidebarcontainer">        <div class="sidebar">          <div class="test1"></div>          <div class="test2"></div>        </div>      </div>    </div>    <!--      -->    <div class="mainpage">      <div class="page"></div>    </div>  </div>  <div class="footer"></div>

the code provided working. have not specified height page height 0. giving height causes become visible: https://jsfiddle.net/kvjw9vhm/

.container{    width: 100%;    background-color: #d5d5d5;  }  .sidebarcontainer{    width: 300px;    height: 2000px;    display: inline-block;    box-sizing: border-box;    padding: 5px;    padding-right: 2px;  }  .innersidebarcontainer{    position: relative;        width: 100%;      height: 100%;  }  .sidebar{    width: 293px;    background-color: white;    height: 700px;    top: 1px;    position: absolute;  }  .mainpage{    width: calc(100% - 300px);    padding: 5px;    padding-right: 2px;    height: 3000px;    display: inline-block;    box-sizing: border-box;    background-color: teal;  }  .page{    width: 100%;    height: 100%; /* width: 100%; */    background-color: white;  }  .footer{    height: 500px;    width: 100%;    margin: 0 auto;    background-color: purple  }  .test1{    background-color: red;    position: absolute;    left: 0;    right: 0;    top: 0;    height: 200px;  }  .test2{    background-color: red;    position: absolute;    left: 0;    right: 0;    bottom: 0;    height: 200px;  }
<body>    <div class="container">      <div class="sidebarcontainer">        <div class="innersidebarcontainer">          <div class="sidebar">            <div class="test1"></div>            <div class="test2"></div>          </div>        </div>      </div>      <div class="mainpage">        <div class="page"></div>      </div>    </div>    <div class="footer"></div>  </body>


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