Page editor (TinyMCE) strips preformatted code entered inside <pre><code> tags.

[Sakis]

Edit some page or post
Switch editor to text
Enter the following snippet

<pre>
<code>
/* Just for testing purposes */

#include <stdio.h>

main()
{
    printf("Hello World");
}
</code>
</pre>

Save, publish or switch to visual
Voila, "<stdio.h>" part is stripped out from both visual editor and page when rendered.

PS: Tested with clean installed WP, no plugins or third party themes, with Chrome, Edge and Safari browsers in Win10 and MacOS X

[azaozz]

Hi @Sakis, don't think this is a bug. In the Text editor you are in HTML context, i.e. you can type HTML tags, attributes, etc. Generally the <, >, and & characters should be encoded to HTML entities. There are syntax highlighting plugins that do this automatically, best would be to use one of them.