Issue #1468582 by Schnitzel, lewisnyman, dcmouyard, alanburke, tstoeckler, edward_or, janusman: Add mobile friendly meta tags to the html.tpl.php.

[hellomrcat]

PR for backdrop/backdrop-issues#200

[quicksketch]

Nice! I'll need to have @jenlampton review this one. It's great to get these in here but we'll have to re-evaluate the approach. D8 eventually went with the equivalent of backdrop_add_html_head() to add these tags, meaning they all ended up as part of the single $head variable.

[jenlampton]

We should remove this closing PHP tag.

[jenlampton]

Yeah, I don't like the extra variable added into the template. If we removed that the changes in core/includes/theme.inc and core/modules/system/html.tpl.php would go away.

We'll need to add a change in common.inc, to backdrop_get_html_head, as follows.

/**
 * Retrieves output to be displayed in the HEAD tag of the HTML page.
 */
function backdrop_get_html_head() {
  $elements = backdrop_add_html_head();

  // Always add the default mobile meta tags.
  $elements['common-viewport'] = array(
    '#type' => 'html_tag',
    '#tag' => 'meta',
    '#attributes' => array(
      'name' => 'viewport',
      'content' => 'width=device-width',
    ),
  );
  $elements['common-cleartype'] = array(
    '#type' => 'html_tag',
    '#tag' => 'meta',
    '#attributes' => array(
      'http-equiv' => 'cleartype',
      'content' => 'on',
    ),
  );

  backdrop_alter('html_head', $elements);
  return backdrop_render($elements);
}

@hellomrcat can you take a stab at this one, and see if the same test from this issue still passes?

[quicksketch]

Super! It looks like D8 ultimately removed the cleartype meta tag in https://www.drupal.org/node/1717090, so I dropped that in the merge. Previously we had Seven adding the mobile meta tag, but that's not necessary if core is adding it. I removed that also as part of the merge. Thanks!