`aria-describedby` attribute. The `summary` attribute is obsolete in HTML5.

  For example:

```
<p id="table1_summary">
    The age demographics of each North American country includes age structures from 0-14 years, 15-64 years, and 65 years and older.
</p>
    
<table aria-describedby="table1_summary">
    <caption>Age Demographics of North American Countries</caption>
      . . .
</table>
```

</script></mark-down>
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