Given that the canvas element has a transparent content model, it may contain fallback elements which are displayed in the event that the canvas
element is unsupported. They will not be displayed if the canvas is supported.
You can position HTML elements relative to the canvas' parent to have the buttons "hovering" over the canvas. A menu element could be an appropriately semantic element to render a list of controls, depending on the context:
HTML:
<div id="container">
<canvas id="viewport">
</canvas>
<menu id="controls">
</menu>
</div>
CSS:
#container
{
height: 400px;
position: relative;
width: 400px;
}
#viewport
{
height: 100%;
width: 100%;
}
#controls
{
bottom: 0;
left: 0;
position: absolute;
width: 100%;
}
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