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Sanitize content for allowed HTML tags for post content.
Post content refers to the page contents of the 'post' type and not $_POST data from forms.
KSES seems to stand for "kses strips evil scripts!".
<?php wp_filter_post_kses( $data ) ?>
Since: 2.0.0
wp_filter_post_kses() is located in wp-includes/kses.php.