protected function maybeCompressCombineFooterJs($html)
    {
        if (($benchmark = !empty($this->options['benchmark']) && $this->options['benchmark'] === 'details')) {
            $time = microtime(true);
        }
        $html = (string) $html; // Force string value.

        if (isset($this->options['compress_combine_footer_js'])) {
            if (!$this->options['compress_combine_footer_js']) {
                $disabled = true; // Disabled flag.
            }
        }
        if (!$html || !empty($disabled)) {
            goto finale; // Nothing to do.
        }
        if (($footer_scripts_frag = $this->getFooterScriptsFrag($html)) /* e.g. <!-- footer-scripts --><!-- footer-scripts --> */) {
            if (($js_tag_frags = $this->getJsTagFrags($footer_scripts_frag)) && ($js_parts = $this->compileJsTagFragsIntoParts($js_tag_frags, 'foot'))) {
                $js_tag_frags_all_compiled = $this->compileKeyElementsDeep($js_tag_frags, 'all');
                $html                      = $this->replaceOnce($footer_scripts_frag['all'], '%%htmlc-footer-scripts%%', $html);
                $cleaned_footer_scripts    = $this->replaceOnce($js_tag_frags_all_compiled, '', $footer_scripts_frag['contents']);

                $compressed_js_tags = []; // Initialize.

                foreach ($js_parts as $_js_part) {
                    if (isset($_js_part['exclude_frag'], $js_tag_frags[$_js_part['exclude_frag']]['all'])) {
                        $compressed_js_tags[] = $js_tag_frags[$_js_part['exclude_frag']]['all'];
                    } else {
                        $compressed_js_tags[] = $_js_part['tag'];
                    }
                } // unset($_js_part); // Housekeeping.

                $compressed_js_tags             = implode("\n", $compressed_js_tags);
                $compressed_footer_script_parts = [$footer_scripts_frag['open_tag'], $cleaned_footer_scripts, $compressed_js_tags, $footer_scripts_frag['closing_tag']];
                $html                           = $this->replaceOnce('%%htmlc-footer-scripts%%', implode("\n", $compressed_footer_script_parts), $html);

                if ($benchmark) {
                    $this->benchmark->addData(
                        __FUNCTION__,
                        compact(
                            'footer_scripts_frag',
                            'js_tag_frags',
                            'js_parts',
                            'cleaned_footer_scripts',
                            'compressed_js_tags',
                            'compressed_footer_script_parts'
                        )
                    );
                }
            }
        }
        finale: // Target point; finale/return value.

        if ($html) {
            $html = trim($html);
        } // Trim it up now!

        if ($benchmark && !empty($time) && $html && empty($disabled)) {
            $this->benchmark->addTime(
                __FUNCTION__,
                $time, // Caller, start time, task performed.
                sprintf('compressing/combining footer JS in checksum: `%1$s`', md5($html))
            );
        }
        return $html; // With possible compression having been applied here.
    }