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<script>
function toggleDisplay(element, button)
{
if (element.style.display == "none")
element.style.display = "";
else
element.style.display = "none";
}
function toggleVisibility(element, button)
{
if (element.style.visibility == "hidden")
element.style.visibility = "";
else
element.style.visibility = "hidden";
}
</script>
<p>
Play with the display and visibility toggles. Make sure that turning an inner element visible does not show it if it has a hidden or
non-displaying ancestor, and that making an ancestor visible and displaying shows only its descendants the are visible and displaying.
</p>
<table>
<tr>
<td>
<input type="checkbox" checked="true" onclick="toggleDisplay(document.getElementById('middle'))"> Outer frame display
</td>
<td>
<input type="checkbox" checked="true" onclick="toggleDisplay(document.getElementById('middle').contentDocument.getElementById('inner'))"> Inner frame display
</td>
</tr>
<tr>
<td>
<input type="checkbox" checked="true" onclick="toggleVisibility(document.getElementById('middle'))"> Outer frame visibility
</td>
<td>
<input type="checkbox" checked="true" onclick="toggleVisibility(document.getElementById('middle').contentDocument.getElementById('inner'))"> Inner frame visibility
</td>
<td>
<input type="checkbox" checked="true" onclick="toggleVisibility(document.getElementById('middle').contentDocument.getElementById('inner').contentDocument.getElementById('plugin'))"> Inner plug-in visibility
</td>
</tr>
</table>
<iframe id="middle" style="height: 400px; width: 400px;" src="resources/nested-plug-ins-outer-frame.html"></iframe>
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