head.php

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<?php
$metas = elgg_extract('metas', $vars, array());
$links = elgg_extract('links', $vars, array());

echo elgg_format_element('title', array(), $vars['title'], array('encode_text' => true));
foreach ($metas as $attributes) {
    echo elgg_format_element('meta', $attributes);
}
foreach ($links as $attributes) {
    echo elgg_format_element('link', $attributes);
}

$stylesheets = elgg_get_loaded_css();

foreach ($stylesheets as $url) {
    echo elgg_format_element('link', array('rel' => 'stylesheet', 'href' => $url));
}

// A non-empty script *must* come below the CSS links, otherwise Firefox will exhibit FOUC
// See https://github.com/Elgg/Elgg/issues/8328
?>
<script>
    <?php // Do not convert this to a regular function declaration. It gets redefined later. ?>
    require = function () {
        // handled in the view "elgg.js"
        _require_queue.push(arguments);
    };
    _require_queue = [];
</script>