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<h1 class="entry-title">Subpixel Animation Issues in IE < 9</h1>
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<time datetime="2012-08-16T21:56:00-04:00" pubdate data-updated="true">Aug 16<span>th</span>, 2012</time>
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<div class="entry-content"><p>While there are definitely <a href="http://ejohn.org/blog/sub-pixel-problems-in-css/">cross browser discrepancies handling subpixels</a>, this one caught me by surprise. Take the following:</p>
<figure class='code'><figcaption class='empty'><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
</pre></td><td class='code'><pre><code class='html'><span class='line'><span class="nt"><div</span> <span class="na">id=</span><span class="s">"box"</span><span class="nt">></div></span>
</span><span class='line'><span class="nt"><script></span>
</span><span class='line'> <span class="kd">var</span> <span class="nx">box</span> <span class="o">=</span> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'box'</span><span class="p">);</span>
</span><span class='line'> <span class="nx">box</span><span class="p">.</span><span class="nx">style</span><span class="p">.</span><span class="nx">left</span> <span class="o">=</span> <span class="s1">'10.25px'</span><span class="p">;</span>
</span><span class='line'> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="nx">box</span><span class="p">.</span><span class="nx">style</span><span class="p">.</span><span class="nx">left</span><span class="p">);</span>
</span><span class='line'><span class="nt"></script></span>
</span></code></pre></td></tr></table></div></figure>
<p>This simply sets a value for the <code>left</code> CSS property then immediately retrieves it. In Chrome 22, Firefox 14, Safari 6, Opera 12, IE >= 9, iOS 5, and Android <code>10.25px</code> will be logged.</p>
<p>In IE < 9 <code>10px</code> is logged. While not all browsers can accurately render the subpixel values, I had assumed all of them would’ve at least allowed the assignment. I was wrong. Internet Explorer will simply round the value to the nearest integer.</p>
<p>Why is this a problem? <!--more-->Take the following code.</p>
<figure class='code'><figcaption class='empty'><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
<span class='line-number'>10</span>
</pre></td><td class='code'><pre><code class='html'><span class='line'><span class="nt"><div</span> <span class="na">id=</span><span class="s">"box"</span><span class="nt">></div></span>
</span><span class='line'><span class="nt"><script></span>
</span><span class='line'> <span class="kd">var</span> <span class="nx">box</span> <span class="o">=</span> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'box'</span><span class="p">);</span>
</span><span class='line'> <span class="nx">box</span><span class="p">.</span><span class="nx">style</span><span class="p">.</span><span class="nx">left</span> <span class="o">=</span> <span class="s1">'0px'</span><span class="p">;</span>
</span><span class='line'> <span class="nx">setInterval</span><span class="p">(</span><span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
</span><span class='line'> <span class="kd">var</span> <span class="nx">currentLeft</span> <span class="o">=</span> <span class="nx">box</span><span class="p">.</span><span class="nx">style</span><span class="p">.</span><span class="nx">left</span><span class="p">.</span><span class="nx">replace</span><span class="p">(</span><span class="s1">'px'</span><span class="p">,</span> <span class="s1">''</span><span class="p">);</span>
</span><span class='line'> <span class="nx">currentLeft</span> <span class="o">=</span> <span class="nb">parseFloat</span><span class="p">(</span><span class="nx">currentLeft</span><span class="p">);</span>
</span><span class='line'> <span class="nx">box</span><span class="p">.</span><span class="nx">style</span><span class="p">.</span><span class="nx">left</span> <span class="o">=</span> <span class="nx">currentLeft</span> <span class="o">+</span> <span class="mf">0.25</span> <span class="o">+</span> <span class="s1">'px'</span><span class="p">;</span>
</span><span class='line'> <span class="p">},</span> <span class="mi">20</span><span class="p">);</span>
</span><span class='line'><span class="nt"></script></span>
</span></code></pre></td></tr></table></div></figure>
<p>This sets an interval that will increase the <code>left</code> property of a box by <code>0.25</code> pixels every 20 milliseconds. Doing so will move the box left across the screen as seen below:</p>
<iframe style="width: 100%; height: 150px;" src="http://jsfiddle.net/tj_vantoll/PBsLt/9/embedded/result,js,html/" allowfullscreen="allowfullscreen" frameborder="0"></iframe>
<p>Great. Unfortunately in IE < 9 the box will not move. Within the interval function the value to increment is being retrieved from the element itself, which, in IE < 9 will continuously return the rounded value.</p>
<p>The way around this is simply to use store off the value of the property outside of the animation loop itself.</p>
<figure class='code'><figcaption class='empty'><span></span></figcaption><div class="highlight"><table><tr><td class="gutter"><pre class="line-numbers"><span class='line-number'>1</span>
<span class='line-number'>2</span>
<span class='line-number'>3</span>
<span class='line-number'>4</span>
<span class='line-number'>5</span>
<span class='line-number'>6</span>
<span class='line-number'>7</span>
<span class='line-number'>8</span>
<span class='line-number'>9</span>
</pre></td><td class='code'><pre><code class='html'><span class='line'><span class="nt"><div</span> <span class="na">id=</span><span class="s">"box"</span><span class="nt">></div></span>
</span><span class='line'><span class="nt"><script></span>
</span><span class='line'> <span class="kd">var</span> <span class="nx">left</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
</span><span class='line'> <span class="kd">var</span> <span class="nx">box</span> <span class="o">=</span> <span class="nb">document</span><span class="p">.</span><span class="nx">getElementById</span><span class="p">(</span><span class="s1">'box'</span><span class="p">);</span>
</span><span class='line'> <span class="nx">setInterval</span><span class="p">(</span><span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
</span><span class='line'> <span class="nx">box</span><span class="p">.</span><span class="nx">style</span><span class="p">.</span><span class="nx">left</span> <span class="o">=</span> <span class="nx">left</span> <span class="o">+</span> <span class="s1">'px'</span><span class="p">;</span>
</span><span class='line'> <span class="nx">left</span> <span class="o">+=</span> <span class="mf">0.25</span><span class="p">;</span>
</span><span class='line'> <span class="p">},</span> <span class="mi">20</span><span class="p">);</span>
</span><span class='line'><span class="nt"></script></span>
</span></code></pre></td></tr></table></div></figure>
<p>This has the added benefit of being more efficient since you save a property retrieval on every invocation of the loop.</p>
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<time datetime="2012-08-16T21:56:00-04:00" pubdate data-updated="true">Aug 16<span>th</span>, 2012</time>
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