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CSS

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HTML 

              
                <h1>Fixed Tables Solve Some Issues</h1>

<table class="sturdy">
  <tr>
    <td>I'm 25% wide.</td>
    <td>I'm 50% wide.</td>
    <td>I'm 25% wide.</td>
  </tr>
  <tr>
    <td>Text down here doesn't affect layout anymore.</td>
    <td>...</td>
    <td>This long sentence would probably have pushed this row wider.</td>
  </tr>
</table>

<table class="nobreak">
  <tr>
    <td>The table itself will not exceed</td>
    <td>the exact width you set the table to be, from content alone.</td>
  </tr>
</table>

<table class="wider">
  <tr>
    <td>Well, unless YOU force it wider by</td>
    <td>setting the cells wider (combined) than the table is wide.</td>
  </tr>
</table>

<table class="ignoreyou">
  <tr>
    <td>It won't go smaller though, it will do a calculation.</td>
    <td>...</td>
  </tr>
  <tr>
    <td>Set to 10px<br>Thus 25% of total 40px</td>
    <td>Set to 30px<br>Thus 75% of total 40px</td>
  </tr>
</table>

<table class="cut-off">
  <thead>
  <tr>
    <th>My favorite feature is being able to ellipsis text.</th>
    <th>It's great for user-generated text.</th>
  </tr>
  </thead>
  <tr>
    <td>Supercalifragilisticexpialidocious Something something something something attrotious</td>
    <td>1</td>
  </tr>
  <tr>
    <td>This little piggy went to market. This little piggy went to bed.</td>
    <td>1</td>
  </tr>
  <tr>
    <td>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Blanditiis amet molestiae earum accusantium nostrum eveniet ipsum soluta ut reprehenderit vel incidunt laboriosam dolorum maiores! Earum deserunt sit unde? Sunt voluptatem!</td>
    <td>1</td>
  </tr>
</table>

<table class="hide">
  <tr>
    <td class="img-1">Overflow can be hidden.</td>
    <td class="img-2">
    <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/3/dock-slice-2.png" />
    </td>
  </tr>
</table>
  
<table class="scroll-code">
  <tr>
    <td>Overflow can scroll. Except in Firefox.</td>
    <td><pre>
body.logged-in article > h2 {
  background: linear-gradient(rgba(0, 0, 0, 0), rgba(255, 0, 0, 0.2));      
}
    </pre></td>
  </tr>
</table>
!

CSS 

              
                td, th {
  border: 1px solid black;
}
table {
  margin: 15px 0;
  border: 1px solid black;
  table-layout: fixed;
  width: 100%; /* must have this set */
}
html {
  background: #ccc;
}
body {
  max-width: 400px;
  margin: 0 auto;
  background: white;
  padding: 10px;
}

.sturdy td:nth-child(1),
.sturdy td:nth-child(3) {
  width: 25%;
}
.sturdy td:nth-child(2) {
  width: 50%;
} 

.nobreak {
  white-space: nowrap;
}

.wider td {
  width: 300px;
}


.ignoreyou td:nth-child(1) {
  width: 10px;
}
.ignoreyou td:nth-child(2) {
  width: 30px;
}

.cut-off th:nth-child(1) {
  width: 75%;
}
.cut-off td:nth-child(1) {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}
.cut-off th:nth-child(2) {
  width: 25%;
}
.cut-off td:nth-child(2) span {
  display: block;
  
}


.hide td {
  overflow: hidden;
}

.scroll-code td {
  overflow: auto;
}
!

JS
!
999px

Console