Exploring the relationship between CSS z-index values and a canvas

http://jsfiddle.net/y2q3yLpj/

In my example, I tried setting the z-index of a canvas to 0 and the z-index of a div to 1. However, despite this configuration, the canvas appeared higher than the div. Surprisingly, when I set the z-index of the canvas to -1, it worked as expected. Can anyone explain why this is happening?

<div id='all'>
  <canvas style="width:100px;height:100px; position:absolute;left:10%;z-index:-1;background-color:yellow;"></canvas>
        <div id=highscore style="width:100px;height:100px;z-index:1;background-color:red;">
        </div>
    </div>
cssz-index

Answer №1

z-index is a CSS property that determines the stacking order of positioned elements, applying only to those that are positioned.

To Resolve:

Add position: absolute; to the highscore element.

See Demo

Answer №2

In order for the z-index property to take effect, the position must be set to absolute

<div id='all'> 
    <canvas style="width:100px;height:100px; position: absolute;left: 10%;z-index:-1;background-color: yellow;"></canvas> 
    <div id="highscore" style="position: absolute;width:100px;height:100px;z-index: 1;background-color: red;"> </div>
</div>

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