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The way HTML's align attribute interacts with CSS properties is only really explained in the HTML5 spec. However, the explanation there is quite opaque. Here there is a clearer version with more explanation.

== Spec ==

<pre>
|  When a user agent is to align descendants of a node, the user
|  agent is expected to align only those descendants that have both
|  their 'margin-left' and 'margin-right' properties computing to a
|  value other than 'auto', that are over-constrained and that have
|  one of those two margins with a used value forced to a greater
|  value, and that do not themselves have an applicable align
|  attribute.
                                              -- HTML5 10.2.4 original
</pre>

Simplified:

<pre>
|  When a user agent is to align descendants of a node, the user agent
|  is expected to align only those descendants that:
|
|   1  have both their 'margin-left' and 'margin-right' properties
|      computing to a value other than 'auto',
|
|   2  are over-constrained, and that have a left or right margin with
|      a used value forced to a greater value, and
|
|   3  do not themselves have an applicable align attribute.

                                              -- tlsa's interpretation
</pre>

I have separated the sentence where I think the criteria are and made it more clear.

== Further explanation ==

=== Criterion 1 detail: ===

A box that doesn't have either left, right, or both left & right margins set to 'auto', to align the box "the CSS way".

=== Criterion 2 example: ===

<pre>
    #example2 { width:200px;
                margin-left: 0;
                margin-right: 0; }

    <div style="width:800px;">
        <div id="example2">
            This div meets criterion 2
        </div>
    </div>
</pre>

Return to Spec/HTML5 Alignment.

Retrieved from "http://wiki.netsurf-browser.org/Spec/HTML5_Alignment"

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