Phone number format recognition
Internet Explorer 11 automatically turns phone numbers into clickable links. This feature works when you have an app that can handle phone numbers, such as Skype.
Here's the developer's perspective phone number detection, including the HTML elements that enable this feature by default and how to turn the feature off when necessary.
When Internet Explorer in the new Windows UI encounters a telephone number as part of content rendered using a supported HTML element, it turns the number into a clickable link (and does so without modifying the DOM). When the user clicks the link, the app registered to the "tel" URI protocol is invoked.
Phone number detection comes into play for the following content patterns:
Phone numbers are also recognized across entities that span inline elements. This means the display property must be set to "inline".
In the patterns shown earlier, "<element>" refers to one of the following HTML elements:
Certain exceptions apply, however. Phone number format recognition is disabled when the contentEditable attribute set to "true". It can be also disabled though group policy or user preferences.
There are a few different ways to control phone number format recognition:
To enable the behavior for an element (and its child elements), set the x-ms-format-detection attribute to "phone" or "all".
To disable the behavior for an element (and its child elements), set the x-ms-format-detection attribute to "none".
To disable the behavior for a webpage, use the meta element:
Remember, there is no guarantee that phone number detection will be enabled for IE11. Users can turn the feature off using preferences and administrators can disable the feature using group policies. Plan accordingly.