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CSS

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JavaScript

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HTML 

              
                <h1>min-width</h1>

<figure class="demo">
  <p class="min min600">Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
  <figcaption>Width = 80% / Minimum Width = 600px</figcaption>
</figure>

<figure class="demo">
  <p class="min min320">Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
  <figcaption>Width = 100% / Minimum Width = 320px</figcaption>
</figure>

<figure class="demo">
  <p class="min min480">Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
  <figcaption>Width = 600px / Minimum Width = 480px (won't work)</figcaption>
</figure>

<figure class="demo">
  <p class="min min-percent">Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
  <figcaption>Width = 100% / Minimum Width = 50% (won't work)</figcaption>
</figure>

<figure class="demo">
  <p class="min em40">Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
  <figcaption>Width = 100% / Minimum Width = 40em</figcaption>
</figure>

<figure class="demo">
  <p class="min rem40">Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
  <figcaption>Width = 100% / Minimum Width = 40rem</figcaption>
</figure>

<h3>Tables</h3>
<figure class="demo">
  <table class="min mintable">
		<thead>
			<tr>
				<th class="chrome"><span>Chrome</span></th>
				<th class="safari"><span>Safari</span></th>
				<th class="firefox"><span>Firefox</span></th>
				<th class="opera"><span>Opera</span></th>
				<th class="ie"><span>IE</span></th>
				<th class="android"><span>Android</span></th>
				<th class="iOS"><span>iOS</span></th>
			</tr>
		</thead>
		<tbody>
			<tr>
				<td class="yep-nope">24+</td>
				<td class="yep-nope">5.1+</td>
				<td class="yep-nope">18+</td>
				<td class="yep-nope">12.1+</td>
				<td class="yep-nope">8+</td>
				<td class="yep-nope">1.0+</td>
				<td class="yep-nope">2.1+</td>
			</tr>
		</tbody>
	</table>
  <figcaption>Width = 100% / Minimum Width = 600px</figcaption>
</figure>

<footer>
  <p><small>*These examples use the entire viewport width in order to understand and grasp the concepts outlined. Squeeze your browser to witness the results.</small></p>
</footer>
!

CSS 

              
                @import "compass/css3";

//========================================
// $Global Styles
//========================================

html {
  background: #444444;
  color: #ffffff;
}

.demo {
  background: #000;
}

//========================================
// $Minimum Width Demo
//========================================

.min {
  background: #e78629;
}

// Min-Width Length Values
// ========================================

// minimum 600px
.min600 {
  width: 80%;
  min-width: 600px;
}

// minimum 320px
.min320 {
  width: 100%;
  min-width: 320px;
}

// minimum 480px
.min480 {
  width: 600px;
  min-width: 480px;
}

// minimum 50%
.min-percent {
  width: 100%;
  min-width: 50%;
}

// minimum 40em
.rem40 {
  width: 100%;
  min-width: 40em;
}

// minimum 40rem
.rem40 {
  width: 100%;
  min-width: 40rem;
}


// Min-Width TABLES
// ========================================

// minimum 30em
.mintable {
  width: 100%;
  min-width: 600px;
}
!

JS
!
999px

Console