html - Force element to wrap depending on sibling width -


as you'll see in snippet , picture below, have container (grey) contains main element (green) , footer.

the footer contains 2 elements (blue , yellow).

what want footer second element (yellow) wraps if footer (blue + yellow) wider main element (green).

i'm enclosing picture don't want run snippet:

screenshot snippet

i tried using flex-wrap on footer works if i'm setting width on footer, i'd prefer not do.

.container {    background-color: grey;    display: inline-block;  }    .narrow-child {    background-color: green;    height: 200px;    width: 100px;  }    .large-child {    background-color: green;    height: 200px;    width: 300px;  }    .footer {    display: flex;    flex-wrap: wrap;    /*width: 100px;*/  }    .footer-sub-element1 {    background-color: blue;    width: 80px;    height: 50px;  }    .footer-sub-element2 {    background-color: yellow;    width: 90px;    height: 50px;  }
<div class="container">    <div class="narrow-child">    </div>    <div class="footer">      <div class="footer-sub-element1">      </div>      <div class="footer-sub-element2">      want wrap      </div>    </div>  </div>    <div class="container">    <div class="large-child">    </div>    <div class="footer">      <div class="footer-sub-element1">      </div>      <div class="footer-sub-element2">      don't want wrap      </div>      </div>    </div>  </div>

the width of .footer cannot dependent of sibling without use of javascript. solution define width of .container instead of .child.

.container {    background-color: grey;    display: inline-block;  }    .narrow {    width: 100px;  }    .large {    width: 300px;  }    .child {    background-color: green;    height: 200px;  }    .footer {    display: flex;    flex-wrap: wrap;    /*width: 100px;*/  }    .footer-sub-element1 {    background-color: blue;    width: 80px;    height: 50px;  }    .footer-sub-element2 {    background-color: yellow;    width: 90px;    height: 50px;  }
<div class="container narrow">    <div class="child">    </div>    <div class="footer">      <div class="footer-sub-element1">      </div>      <div class="footer-sub-element2">      want wrap      </div>    </div>  </div>    <div class="container large">    <div class="child">    </div>    <div class="footer">      <div class="footer-sub-element1">      </div>      <div class="footer-sub-element2">      don't want wrap      </div>      </div>    </div>  </div>


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