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<!DOCTYPE html>
<style>
.grid {
  display: inline-grid;
  border: 1px solid black;
  grid-template-columns: [u] repeat(auto-fill, [v] 10px [w] 10px [x] 10px [y]) [z];
  grid-column-gap: 3px;
  /* Does not fit a whole-number of repetitions */
  width: 94px;
  background: pink;
}
div > div {
  background: blue;
  width: 100%;
  height: 25px;
}
</style>
<body>
    <!-- u -->
    <div class="grid">
        <div style="grid-column-start: u"></div>
    </div>
    <!-- non-existent line name -->
    <div class="grid">
        <div style="grid-column-start: nonesuch"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: u 1"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: u -1"></div>
    </div>
    <!-- Also non-existent, there is only one u -->
    <div class="grid">
        <div style="grid-column-start: u 4"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: u 9"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: u 2"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: u -2"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: u -6"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: u -7"></div>
    </div>
    <!-- v -->
    <div class="grid">
        <div style="grid-column-start: v"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: v 1"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: v 2"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: v -1"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: v -2"></div>
    </div>
    <!-- Also non-existent, there are only two v's -->
    <div class="grid">
        <div style="grid-column-start: v 3"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: v -3"></div>
    </div>
    <!-- w -->
    <div class="grid">
        <div style="grid-column-start: w"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: w 1"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: w 2"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: w -1"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: w -2"></div>
    </div>
    <!-- Also non-existent, there are only two w's -->
    <div class="grid">
        <div style="grid-column-start: w 3"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: w -3"></div>
    </div>
    <!-- x -->
    <div class="grid">
        <div style="grid-column-start: x"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: x 1"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: x 2"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: x -1"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: x -2"></div>
    </div>
    <!-- Also non-existent, there are only two x's -->
    <div class="grid">
        <div style="grid-column-start: x 3"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: x -3"></div>
    </div>
    <!-- y -->
    <div class="grid">
        <div style="grid-column-start: y"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: y 1"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: y 2"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: y -1"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: y -2"></div>
    </div>
    <!-- Also non-existent, there are only two y's -->
    <div class="grid">
        <div style="grid-column-start: y -3"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: y 3"></div>
    </div>
    <!-- z -->
    <div class="grid">
        <div style="grid-column-start: z"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: z 1"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: z -1"></div>
    </div>
    <!-- Also non-existent, there is only one z -->
    <div class="grid">
        <div style="grid-column-start: z 2"></div>
    </div>
    <div class="grid">
        <div style="grid-column-start: z -2"></div>
    </div>
</body>