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Only adjacent elements collapse

It is somewhat common to use the <br /> tag (a line-break) to increase space between block elements.

  p {
    margin-top: 32px;
    margin-bottom: 32px;
<p>Paragraph One</p>
<br />
<p>Paragraph Two</p>
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Regrettably, this has an adverse effect on our margins:

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The <br /> tag is invisible and empty, but any element between two others will block margins from collapsing. Elements need to be adjacent in the DOM for their margins to collapse*.

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