Solved: CSS Alternating row color

Hello Experts.
Would like to make every other color in a table light grey
to make it easier to read. Found several websites that
show snippets like
tr:nth-child(odd) { background-color:#eee; }
tr:nth-child(even) { background-color:#fff; }
but when I put them into a page they don't work.

So I found a site that shows the complete page at
http://www.csstothepoint.com/rowalternating.htm
and there is an example from this page at
http://www.csstothepoint.com/example_rowalternating.htm
that looks like what is desired.
Like this

When a VIew>Source is done the code copied below
is displayed.
When the code is pasted into an HTML file I get

Using IE 10 for both views.
How can the same code, one view from the
web and one viewed from the hard drive
display so differently?

Thanks.

Allen in Dallas

<html>
<head>

<style>
tr:nth-child(even) {
background-color: #0000ff;
color: #ffffff;
}
</style>

</head>

<body>
<table>
<tr>
<td>Germany</td>
<td>4-0</td>
<td>Australia</td>
</tr>
<tr>
<td>Germany</td>
<td>4-1</td>
<td>England</td>
</tr>
<tr>
<td>Germany</td>
<td>4-0</td>
<td>Argentina</td>
</tr>
</table>

</body>
</html>