We are going to use
After implementing this, visitors can use the same search form to search sitewide on rest of the pages and search entries of a CPT (like projects or portfolio or testimonials) on CPT single and archive pages.
Install and activate Code Snippets plugin.
Go to Snippets > Add New.
Title: Add support for HTML5 markup
add_theme_support( 'html5', array( 'comment-list', 'comment-form', 'search-form', 'gallery', 'caption' ) );
Save changes and activate.
Add another snippet.
Title: Limit search results to "testimonial" entries on Testimonial single pages and CPT archive
Change the above text depending on the name of your CPT.
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