wp_resource_hints

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Summery Summery

Prints resource hints to browsers for pre-fetching, pre-rendering and pre-connecting to web sites.

Syntax Syntax

wp_resource_hints()

Description Description

Gives hints to browsers to prefetch specific pages or render them in the background, to perform DNS lookups or to begin the connection handshake (DNS, TCP, TLS) in the background.

These performance improving indicators work by using <link rel"…">.

Source Source

File: wp-includes/general-template.php

function wlwmanifest_link() {
	echo '<link rel="wlwmanifest" type="application/wlwmanifest+xml" href="' . includes_url( 'wlwmanifest.xml' ) . '" /> ' . "\n";
}

/**
 * Displays a noindex meta tag if required by the blog configuration.
 *
 * If a blog is marked as not being public then the noindex meta tag will be
 * output to tell web robots not to index the page content. Add this to the
 * {@see 'wp_head'} action.
 *
 * Typical usage is as a {@see 'wp_head'} callback:
 *
 *     add_action( 'wp_head', 'noindex' );
 *
 * @see wp_no_robots
 *
 * @since 2.1.0
 */
function noindex() {
	// If the blog is not public, tell robots to go away.
	if ( '0' == get_option( 'blog_public' ) ) {
		wp_no_robots();
	}
}

/**
 * Display a noindex meta tag.
 *
 * Outputs a noindex meta tag that tells web robots not to index the page content.
 * Typical usage is as a {@see 'wp_head'} callback. add_action( 'wp_head', 'wp_no_robots' );
 *
 * @since 3.3.0
 * @since 5.3.0 Echo "noindex,nofollow" if search engine visibility is discouraged.
 */
function wp_no_robots() {
	if ( get_option( 'blog_public' ) ) {
		echo "<meta name='robots' content='noindex,follow' />\n";
		return;
	}

	echo "<meta name='robots' content='noindex,nofollow' />\n";
}

/**
 * Display a noindex,noarchive meta tag and referrer origin-when-cross-origin meta tag.
 *
 * Outputs a noindex,noarchive meta tag that tells web robots not to index or cache the page content.
 * Outputs a referrer origin-when-cross-origin meta tag that tells the browser not to send the full
 * url as a referrer to other sites when cross-origin assets are loaded.
 *
 * Typical usage is as a wp_head callback. add_action( 'wp_head', 'wp_sensitive_page_meta' );
 *
 * @since 5.0.1
 */
function wp_sensitive_page_meta() {
	?>
	<meta name='robots' content='noindex,noarchive' />
	<meta name='referrer' content='strict-origin-when-cross-origin' />
	<?php
}

/**
 * Display site icon meta tags.
 *
 * @since 4.3.0
 *
 * @link https://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#rel-icon HTML5 specification link icon.
 */
function wp_site_icon() {
	if ( ! has_site_icon() && ! is_customize_preview() ) {
		return;
	}

	$meta_tags = array();
	$icon_32   = get_site_icon_url( 32 );
	if ( empty( $icon_32 ) && is_customize_preview() ) {
		$icon_32 = '/favicon.ico'; // Serve default favicon URL in customizer so element can be updated for preview.
	}
	if ( $icon_32 ) {
		$meta_tags[] = sprintf( '<link rel="icon" href="%s" sizes="32x32" />', esc_url( $icon_32 ) );
	}
	$icon_192 = get_site_icon_url( 192 );
	if ( $icon_192 ) {
		$meta_tags[] = sprintf( '<link rel="icon" href="%s" sizes="192x192" />', esc_url( $icon_192 ) );
	}
	$icon_180 = get_site_icon_url( 180 );
	if ( $icon_180 ) {
		$meta_tags[] = sprintf( '<link rel="apple-touch-icon" href="%s" />', esc_url( $icon_180 ) );
	}
	$icon_270 = get_site_icon_url( 270 );
	if ( $icon_270 ) {
		$meta_tags[] = sprintf( '<meta name="msapplication-TileImage" content="%s" />', esc_url( $icon_270 ) );
	}

	/**

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Changelog Changelog

Changelog
Version Description
4.6.0 Introduced.

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