What is the difference between esc_html and wp_filter_nohtml_kses?

Contrary to what you have been looking at, esc_html does not strip all the HTML, it escapes it, meaning it encodes it into safe HTML entities that do not break HTML tags.

wp_filter_nohtml_kses strips all the HTML.

When in doubt always consult the source code. It is accessible online.

esc_attr is short and sweet, uses _wp_specialchars, defined in wp-includes/formatting.php

wp_filter_nohtml_kses is defined in wp-includes/kses.php, and “Strips all of the HTML in the content.“

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