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This Conditional Tag checks if a custom taxonomy archive page is being displayed. This is a boolean function, meaning it returns either TRUE or FALSE.
If the $taxonomy parameter is specified, this function will additionally check if the query is for that specific taxonomy.
To check for a taxonomy term on a specific post, use has_term()
<?php is_tax( $taxonomy, $term ); ?>
is_tax(); // When any custom taxonomy archive page is being displayed. is_tax( 'channel' ); // When the archive page for taxonomy of 'channel' is being displayed. is_tax( 'channel', 'BBC1' ); // When the archive page for taxonomy of 'channel' is being displayed and the 'channel' taxonomy term is 'BBC1'.
The taxonomy slug for Post Formats differs from the Post Format slug. The register_taxonomy() function appends a post-format- base to the Post Format slug. So, e.g. while the "Aside" Post Format type has a slug of aside, the post_format taxonomy term "Aside" has a slug of post-format-aside.
is_tax( 'post_format' ); // When the archive page for any Post Format term is being displayed. is_tax( 'post_format', 'post-format-aside' ); // When the archive page for Post Format type 'aside' is being displayed.
is_tax() is located in