The comma at the end of "list of presidents" results in a syntax error when run through a validator.
So:
<script type="application/ld+json">
{
"@context": "http://schema.org",
"@type": "Table",
"about": "list of presidents",
}
</script>
Should be:
<script type="application/ld+json">
{
"@context": "http://schema.org",
"@type": "Table",
"about": "list of presidents"
}
</script>
The comma at the end of "list of presidents" results in a syntax error when run through a validator.
So:
Should be: