Type: String
The DocTypeTag property can be used to set the "<!DOCTYPE>" tag that BrowserHawk writes out in the HTML of the temporary page displayed while performing an extended property test. Setting this may be helpful or even mandatory if you are specifying a htmlForBodyTagAsString parameter in your call to GetExtProperties in order for your custom HTML to display properly. Note that by default BrowserHawk does not write out a <!DOCTYPE> tag into the temporary page used during the extended property test.
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