WordPress at a glance
function is not described

Pelago\Emogrifier\HtmlProcessor

AbstractHtmlProcessor::ensureDocumentType() private WC 1.0

Makes sure that the passed HTML has a document type.

{} It's a method of the class: AbstractHtmlProcessor{}

No Hooks.

Return

String. HTML with document type

Usage

// private - for code of main (parent) class only
$result = $this->ensureDocumentType( $html );
$html(string) (required)
-

Code of AbstractHtmlProcessor::ensureDocumentType() WC 5.0.0

<?php
private function ensureDocumentType($html)
{
    $hasDocumentType = \stripos($html, '<!DOCTYPE') !== false;
    if ($hasDocumentType) {
        return $html;
    }

    return static::DEFAULT_DOCUMENT_TYPE . $html;
}