IdAttribute.php

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<?php
namespace TYPO3\CMS\Form\Domain\Model\Attribute;

class IdAttribute extends \TYPO3\CMS\Form\Domain\Model\Attribute\AbstractAttribute {

    public function getValue() {
        $value = (string) $this->value;
        if ($this->elementClassName === 'TYPO3\\CMS\\Form\\Domain\\Model\\Form') {
            if (empty($value)) {
                $value = 'form-' . $GLOBALS['TSFE']->id;
            }
        } elseif (empty($value)) {
            $value = $this->elementId;
            if (is_integer($value)) {
                $value = 'field-' . $value;
            }
        }
        // Change spaces into hyphens
        $attribute = preg_replace('/\\s/', '-', $value);
        // Change first non-letter to field-
        if (preg_match('/^([^a-zA-Z]{1})/', $attribute)) {
            $attribute = 'field-' . $attribute;
        }
        // Remove non-word characters
        $attribute = preg_replace('/([^a-zA-Z0-9_:\\-\\.]*)/', '', $attribute);
        return $attribute;
    }

}