small fix (mdn#6178)

rachelandrew · web-flow · commit 0abcfa3ed7d7 · 2021-06-21T21:01:35.000+09:00
diff --git a/files/en-us/web/css/css_box_model/mastering_margin_collapsing/index.html b/files/en-us/web/css/css_box_model/mastering_margin_collapsing/index.html
@@ -17,7 +17,7 @@
  <dt>Adjacent siblings</dt>
  <dd>The margins of adjacent siblings are collapsed (except when the latter sibling needs to be <a href="/en-US/docs/Web/CSS/clear">cleared</a> past floats).</dd>
  <dt>No content separating parent and descendants</dt>
- <dd>If there is no border, padding, inline part, <a href="/en-US/docs/Web/Guide/CSS/Block_formatting_context">block formatting context</a> created, or <em><a href="/en-US/docs/Web/CSS/clear">clearance</a></em> to separate the {{cssxref("margin-top")}} of a block from the {{cssxref("margin-top")}} of one or more of its descendant blocks; or no border, padding, inline content, {{cssxref("height")}}, {{cssxref("min-height")}}, or {{cssxref("max-height")}} to separate the {{cssxref("margin-bottom")}} of a block from the {{cssxref("margin-bottom")}} of one or more of its descendant blocks, then those margins collapse. The collapsed margin ends up outside the parent.</dd>
+ <dd>If there is no border, padding, inline part, <a href="/en-US/docs/Web/Guide/CSS/Block_formatting_context">block formatting context</a> created, or <em><a href="/en-US/docs/Web/CSS/clear">clearance</a></em> to separate the {{cssxref("margin-top")}} of a block from the {{cssxref("margin-top")}} of one or more of its descendant blocks; or no border, padding, inline content, {{cssxref("height")}}, or {{cssxref("min-height")}} to separate the {{cssxref("margin-bottom")}} of a block from the {{cssxref("margin-bottom")}} of one or more of its descendant blocks, then those margins collapse. The collapsed margin ends up outside the parent.</dd>
  <dt>Empty blocks</dt>
  <dd>If there is no border, padding, inline content, {{cssxref("height")}}, or {{cssxref("min-height")}} to separate a block's {{cssxref("margin-top")}} from its {{cssxref("margin-bottom")}}, then its top and bottom margins collapse.</dd>
 </dl>
