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Title Tag is a theme feature, first introduced in Version 4.1. This feature allows themes to add document title tag to HTML <head>.
Since Version 4.1, themes should use add_theme_support() in the functions.php file in order to support title tag, like so:
add_theme_support( 'title-tag' );
To add backwards compatibility for older versions, use the following code:
<?php
if ( ! function_exists( '_wp_render_title_tag' ) ) {
function theme_slug_render_title() {
?>
<title><?php wp_title( '|', true, 'right' ); ?></title>
<?php
}
add_action( 'wp_head', 'theme_slug_render_title' );
}
?>
Theme Support:
add_theme_support(),
remove_theme_support(),
current_theme_supports()
Theme Features:
sidebar,
menus,
post-formats,
title-tag,
custom-background,
custom-header,
custom-logo,
post-thumbnails,
automatic-feed-links,
html5,
editor-style,
content_width
Filter the title tag text with wp_title: https://developer.wordpress.org/reference/hooks/wp_title/