Limit table cell to only one line of text? 'overflow' and 'white-space' not working

Limit table cell to only one line of text? 'overflow' and 'white-space'
not working

Fiddle
I have a table w/ multiple columns and rows, and I'm trying to limit each
cell to only one line of text. Second lines and beyond I want hidden
because multiple lines disrupt the height of each table row.
First off, some sells contain
tags, and the following code is not fixing this issue:
table {
table-layout: fixed;
}
td {
overflow: hidden;
white-space: nowrap;
width: 50px;
}
How can I effectively limit each cell to only one line of text?