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I am new to Drupal, but I am very familiar with WordPress.

In WordPress, I am able to hook into the head of a document with wp_head to add things like page specific meta tags.

When using a custom theme based on Stable, how would you add page specific things in the <head> of a document in Drupal 8?

Note: I am wondering how this would be done without a custom module.

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You can attach the tag to the page's render array via hook_page_attachments_alter().

An example from the related change record:

function MYTHEME_page_attachments_alter(array &$page) {
    $viewport = array(
        '#type' => 'html_tag',
        '#tag' => 'meta',
        '#attributes' => array(
            'name' => 'viewport',
            'content' => 'width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no',
        ),
    );
    $page['#attached']['html_head'][] = [$viewport, 'viewport'];
}
  • Nice. Where would I be able to find all of the # keys available to me? I viewed the contents of $page and it looks like I have one key #attached with library, html_head_link, html_head as sub keys. Are there others that I could add? – Raphael Rafatpanah Jul 3 '17 at 13:10
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    Anywhere, really - the # properties are arbitrary, they describe meta info about the render array and can be literally any valid string that starts with a #. The method that renders whatever element type the property is on decides what to do with it. It's better to approach it as "what do I need to do?" rather than "what are all the things I could do?", as it's basically infinite by nature – Clive Jul 3 '17 at 13:18

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