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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - CSS matrix3d transform inconsistent under full page zoom"
   href="https://bugs.webkit.org/show_bug.cgi?id=164580">164580</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>CSS matrix3d transform inconsistent under full page zoom
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>CSS
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>fta2012&#64;gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Chromium bug: <a href="https://bugs.chromium.org/p/chromium/issues/detail?id=242685">https://bugs.chromium.org/p/chromium/issues/detail?id=242685</a>.

Fixed in <a href="https://codereview.chromium.org/2482753002">https://codereview.chromium.org/2482753002</a>

Analogous change is in <a href="https://github.com/WebKit/webkit/blob/48bf6ce187a5b7a28b8ab4e3f3e45866487b5b17/Source/WebCore/css/TransformFunctions.cpp#L292">https://github.com/WebKit/webkit/blob/48bf6ce187a5b7a28b8ab4e3f3e45866487b5b17/Source/WebCore/css/TransformFunctions.cpp#L292</a> where it should be:

            TransformationMatrix matrix(downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(0)).doubleValue(),
                downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(1)).doubleValue(),
                downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(2)).doubleValue(),
                downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(3)).doubleValue() / conversionData.zoom(),
                downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(4)).doubleValue(),
                downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(5)).doubleValue(),
                downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(6)).doubleValue(),
                downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(7)).doubleValue() / conversionData.zoom(),
                downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(8)).doubleValue(),
                downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(9)).doubleValue(),
                downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(10)).doubleValue(),
                downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(11)).doubleValue() / conversionData.zoom(),
                conversionData.zoom() * downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(12)).doubleValue(),
                conversionData.zoom() * downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(13)).doubleValue(),
                conversionData.zoom() * downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(14)).doubleValue(),
                downcast&lt;CSSPrimitiveValue&gt;(*transformValue.itemWithoutBoundsCheck(15)).doubleValue());

Or have that logic encapsulated in a zoom method on TransformationMatrix.</pre>
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