html - CSS table layout: why does table-row not accept a margin?

Question

.container {
  width: 850px;
  padding: 0;
  display: table;
  margin-left: auto;
  margin-right: auto;
}
.row {
  display: table-row;
  margin-bottom: 30px;
  /* HERE */
}
.home_1 {
  width: 64px;
  height: 64px;
  padding-right: 20px;
  margin-right: 10px;
  display: table-cell;
}
.home_2 {
  width: 350px;
  height: 64px;
  padding: 0px;
  vertical-align: middle;
  font-size: 150%;
  display: table-cell;
}
.home_3 {
  width: 64px;
  height: 64px;
  padding-right: 20px;
  margin-right: 10px;
  display: table-cell;
}
.home_4 {
  width: 350px;
  height: 64px;
  padding: 0px;
  vertical-align: middle;
  font-size: 150%;
  display: table-cell;
}

<div class="container">
  <div class="row">
    <div class="home_1"></div>
    <div class="home_2"></div>
    <div class="home_3"></div>
    <div class="home_4"></div>
  </div>

  <div class="row">
    <div class="home_1"></div>
    <div class="home_2"></div>
  </div>
</div>

Answer 1

See the CSS 2.1 standard, section 17.5.3. When you use display:table-row, the height of the DIV is solely determined by the height of the table-cell elements in it. Thus, margin, padding, and height on those elements have no effect.

http://www.w3.org/TR/CSS2/tables.html