html - CSS color transition behavior for images with transparent backgrounds -

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i've noticed unanticipated effect of using css color transitions on image transparent background. here's example:

:root {    --size: 4em;    --duration: 5s;  }  html, body {    margin: 0;    background: slategray;    color: white;  }  .main-menu {    overflow: hidden;    background: black;  }  .main-menu *:hover {    background: skyblue;    -webkit-transition-duration: 5s;    transition-duration: var(--duration);  }  .image-div {    float: right;    padding: calc(var(--size) / 2);    -webkit-transition-duration: 5s;    transition-duration: var(--duration);  }  .image {    max-width: var(--size);  }
<div class="main-menu">    <div class="image-div">      <img class="image" src="https://s4.postimg.org/5zy6kjqcd/maximize.png"/>    </div>  </div>

to summarize, issue this. if hover on image-div div's padding, background color of div , contained image div execute color transition @ same rate, expected. however, if hover on image div, color appears transition faster image-div div's color.

given fact able reproduce exact behavior on firefox, chrome, safari , edge, feeling expected behavior, understand why happening.

when hover on img two hover events triggered - 1 on img , 1 on parent image-div when use * in .main-menu *:hover selector:

instead use hover only on image-div below:

.main-menu .image-div:hover {   background: skyblue; }

and difference in transition not there - see demo below:

html, body {    margin: 0;    background: slategray;    color: white;  }  .main-menu {    overflow: hidden;    background: black;  }  .main-menu .image-div:hover {    background: skyblue;  }  .image-div {    float: right;    padding: calc(4em / 2);    -webkit-transition-duration: 5s;    transition-duration: 5s;  }  .image {    max-width: 4em;  }
<div class="main-menu">    <div class="image-div">      <img class="image" src="https://s4.postimg.org/5zy6kjqcd/maximize.png"/>    </div>  </div>





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