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background-canvas-interactive-iframe.html
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<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<style>
iframe {
width: 100%;
height: 100%;
display: block;
position: fixed;
top: 0;
left: 0;
z-index: -9999;
pointer-events: auto;
}
</style>
</head>
<body>
<iframe src="background-canvas-interactive-iframe-background.html"></iframe>
<pre id="content">
scroll down see background doesn't move
Note that input to the iframe is problematic because the mouse events are eaten
by this content's element. You can fix that with
pointer-events: none;
but then you get the issue that you can no longer click links nor select text.
You could mark <a> tags as
pointer-events: auto;
Which would fix links but still no text selection
----
Let's
try
to
make
sure
it's
long
enough
that
we
can
scroll
down
the
page
so
we
can
see
that
position: fixed;
is
a
better
choice
than
position: absolute;
For
a
tall
screen
this
might
take
quite
a
few
lines
of
text
let's
hope
this
is
enough
</pre>
</body>
</html>