Backporting them from Drupal 8.

      <meta name="MobileOptimized" content="width" />
      <meta name="HandheldFriendly" content="true" />
      <meta name="viewport" content="width=device-width" />
      <meta http-equiv="cleartype" content="on" />

Related:
#1468582: Add mobile friendly meta tags to the html.tpl.php
#1616896: Revert: "Remove $default_mobile_metatags"
https://github.com/h5bp/html5-boilerplate/issues/824

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DamienMcKenna
Location NH, USA
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Component: User interface » Code
DamienMcKenna’s picture

DamienMcKenna
Location NH, USA
CreditAttribution: DamienMcKenna commented
Component: Code » Other tags
DamienMcKenna’s picture

DamienMcKenna
Location NH, USA
CreditAttribution: DamienMcKenna commented
Status: Active » Closed (duplicate)

Duplicate of #1285946: Add new meta tags: mobile which will cover additional tags.