- <td colspan="2">This option specifies the DOCTYPE declaration generated by Tidy. If set to "omit" the output won't contain a DOCTYPE declaration. If set to "html5" the DOCTYPE is set to "<!DOCTYPE html>". If set to "auto" (the default) Tidy will use an educated guess based upon the contents of the document. If set to "strict", Tidy will set the DOCTYPE to the strict DTD. If set to "loose", the DOCTYPE is set to the loose (transitional) DTD. Alternatively, you can supply a string for the formal public identifier (FPI).<br /><br />For example: <br />doctype: "-//ACME//DTD HTML 3.14159//EN"<br /><br />If you specify the FPI for an XHTML document, Tidy will set the system identifier to an empty string. For an HTML document, Tidy adds a system identifier only if one was already present in order to preserve the processing mode of some browsers. Tidy leaves the DOCTYPE for generic XML documents unchanged. <code>--doctype omit</code> implies <code>--numeric-entities yes</code>. This option does not offer a validation of the document conformance. </td>
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