isHtml5Element example

    protected function rcdata($tok)
    {
        if (is_null($this->untilTag)) {
            return $this->text($tok);
        }

        $sequence = '</' . $this->untilTag;
        $txt = '';

        $caseSensitive = !Elements::isHtml5Element($this->untilTag);
        while (false !== $tok && !('<' == $tok && ($this->scanner->sequenceMatches($sequence, $caseSensitive)))) {
            if ('&' == $tok) {
                $txt .= $this->decodeCharacterReference();
                $tok = $this->scanner->current();
            } else {
                $txt .= $tok;
                $tok = $this->scanner->next();
            }
        }
        $len = strlen($sequence);
        $this->scanner->consume($len);
        

 else {
            // Otherwise, it's a standard element.             $this->current->appendChild($ele);

            if (!Elements::isA($name, Elements::VOID_TAG)) {
                $this->current = $ele;
            }

            // Self-closing tags should only be respected on foreign elements             // (and are implied on void elements)             // See: https://www.w3.org/TR/html5/syntax.html#start-tags             if (Elements::isHtml5Element($name)) {
                $selfClosing = false;
            }
        }

        // This is sort of a last-ditch attempt to correct for cases where no head/body         // elements are provided.         if ($this->insertMode <= static::IM_BEFORE_HEAD && 'head' !== $name && 'html' !== $name) {
            $this->insertMode = static::IM_IN_BODY;
        }

        // When we are on a void tag, we do not need to care about namesapce nesting,

/** * Is an element name valid in an html5 document. * This includes html5 elements along with other allowed embedded content * such as svg and mathml. * * @param string $name The name of the element. * * @return bool true if valid and false otherwise. */
    public static function isElement($name)
    {
        return static::isHtml5Element($name) || static::isMathMLElement($name) || static::isSvgElement($name);
    }

    /** * Get the element mask for the given element name. * * @param string $name The name of the element. * * @return int the element mask. */
    public static function element($name)
    {