diff --git a/adminer/create.inc.php b/adminer/create.inc.php
index 6574e83d..04f37bff 100644
--- a/adminer/create.inc.php
+++ b/adminer/create.inc.php
@@ -182,7 +182,7 @@ foreach ($engines as $engine) {
 <p>
 <?php if (support("columns") || $TABLE == "") { ?>
 <?php echo lang('Table name'); ?>: <input name="name" data-maxlength="64" value="<?php echo h($row["name"]); ?>" autocapitalize="off">
-<?php if ($TABLE == "" && !$_POST) { echo script("focus(qs('#form')['name']);"); } ?>
+<?php if ($TABLE == "" && !$_POST) { echo script("focus(gid('form')['name']);"); } ?>
 <?php echo ($engines ? "<select name='Engine'>" . optionlist(array("" => "(" . lang('engine') . ")") + $engines, $row["Engine"]) . "</select>" . help_script_command("value", true) : ""); ?>
  <?php echo ($collations && !preg_match("~sqlite|mssql~", $jush) ? html_select("Collation", array("" => "(" . lang('collation') . ")") + $collations, $row["Collation"]) : ""); ?>
  <input type="submit" value="<?php echo lang('Save'); ?>">
diff --git a/adminer/database.inc.php b/adminer/database.inc.php
index bc5e4dbf..6d9e6876 100644
--- a/adminer/database.inc.php
+++ b/adminer/database.inc.php
@@ -66,7 +66,7 @@ echo ($_POST["add_x"] || strpos($name, "\n")
 	'mariadb' => "supported-character-sets-and-collations/",
 	'mssql' => "ms187963.aspx",
 )) : "");
-echo script("focus(qs('#name'));");
+echo script("focus(gid('name'));");
 ?>
 <input type="submit" value="<?php echo lang('Save'); ?>">
 <?php
diff --git a/adminer/db.inc.php b/adminer/db.inc.php
index f07938e6..03633a98 100644
--- a/adminer/db.inc.php
+++ b/adminer/db.inc.php
@@ -94,7 +94,7 @@ if ($adminer->homepage()) {
 			echo "<table cellspacing='0' class='nowrap checkable'>\n";
 			echo script("mixin(qsl('table'), {onclick: tableClick, ondblclick: partialArg(tableClick, true)});");
 			echo '<thead><tr class="wrap">';
-			echo '<td><input id="check-all" type="checkbox" class="jsonly">' . script("qs('#check-all').onclick = partial(formCheck, /^(tables|views)\[/);", "");
+			echo '<td><input id="check-all" type="checkbox" class="jsonly">' . script("gid('check-all').onclick = partial(formCheck, /^(tables|views)\[/);", "");
 			echo '<th>' . lang('Table');
 			echo '<td>' . lang('Engine') . doc_link(array('sql' => 'storage-engines.html'));
 			echo '<td>' . lang('Collation') . doc_link(array('sql' => 'charset-charsets.html', 'mariadb' => 'supported-character-sets-and-collations/'));
diff --git a/adminer/dump.inc.php b/adminer/dump.inc.php
index eaf5a462..a9512e0f 100644
--- a/adminer/dump.inc.php
+++ b/adminer/dump.inc.php
@@ -182,8 +182,8 @@ $prefixes = array();
 if (DB != "") {
 	$checked = ($TABLE != "" ? "" : " checked");
 	echo "<thead><tr>";
-	echo "<th style='text-align: left;'><label class='block'><input type='checkbox' id='check-tables'$checked>" . lang('Tables') . "</label>" . script("qs('#check-tables').onclick = partial(formCheck, /^tables\\[/);", "");
-	echo "<th style='text-align: right;'><label class='block'>" . lang('Data') . "<input type='checkbox' id='check-data'$checked></label>" . script("qs('#check-data').onclick = partial(formCheck, /^data\\[/);", "");
+	echo "<th style='text-align: left;'><label class='block'><input type='checkbox' id='check-tables'$checked>" . lang('Tables') . "</label>" . script("gid('check-tables').onclick = partial(formCheck, /^tables\\[/);", "");
+	echo "<th style='text-align: right;'><label class='block'>" . lang('Data') . "<input type='checkbox' id='check-data'$checked></label>" . script("gid('check-data').onclick = partial(formCheck, /^data\\[/);", "");
 	echo "</thead>\n";
 
 	$views = "";
@@ -208,7 +208,7 @@ if (DB != "") {
 } else {
 	echo "<thead><tr><th style='text-align: left;'>";
 	echo "<label class='block'><input type='checkbox' id='check-databases'" . ($TABLE == "" ? " checked" : "") . ">" . lang('Database') . "</label>";
-	echo script("qs('#check-databases').onclick = partial(formCheck, /^databases\\[/);", "");
+	echo script("gid('check-databases').onclick = partial(formCheck, /^databases\\[/);", "");
 	echo "</thead>\n";
 	$databases = $adminer->databases();
 	if ($databases) {
diff --git a/adminer/include/adminer.inc.php b/adminer/include/adminer.inc.php
index a0002660..011ed46a 100644
--- a/adminer/include/adminer.inc.php
+++ b/adminer/include/adminer.inc.php
@@ -129,7 +129,7 @@ class Adminer {
 		echo "<table cellspacing='0' class='layout'>\n";
 		echo $this->loginFormField('driver', '<tr><th>' . lang('System') . '<td>', html_select("auth[driver]", $drivers, DRIVER, "loginDriver(this);") . "\n");
 		echo $this->loginFormField('server', '<tr><th>' . lang('Server') . '<td>', '<input name="auth[server]" value="' . h(SERVER) . '" title="hostname[:port]" placeholder="localhost" autocapitalize="off">' . "\n");
-		echo $this->loginFormField('username', '<tr><th>' . lang('Username') . '<td>', '<input name="auth[username]" id="username" value="' . h($_GET["username"]) . '" autocomplete="username" autocapitalize="off">' . script("focus(qs('#username')); qs('#username').form['auth[driver]'].onchange();"));
+		echo $this->loginFormField('username', '<tr><th>' . lang('Username') . '<td>', '<input name="auth[username]" id="username" value="' . h($_GET["username"]) . '" autocomplete="username" autocapitalize="off">' . script("focus(gid('username')); gid('username').form['auth[driver]'].onchange();"));
 		echo $this->loginFormField('password', '<tr><th>' . lang('Password') . '<td>', '<input type="password" name="auth[password]" autocomplete="current-password">' . "\n");
 		echo $this->loginFormField('db', '<tr><th>' . lang('Database') . '<td>', '<input name="auth[db]" value="' . h($_GET["db"]) . '" autocapitalize="off">' . "\n");
 		echo "</table>\n";
@@ -557,7 +557,7 @@ class Adminer {
 			json_row($key);
 		}
 		echo ";\n";
-		echo "selectFieldChange.call(qs('#form')['select']);\n";
+		echo "selectFieldChange.call(gid('form')['select']);\n";
 		echo "</script>\n";
 		echo "</div></fieldset>\n";
 	}
@@ -1073,7 +1073,7 @@ class Adminer {
 				}
 			}
 			if ($output) {
-				echo "<ul id='logins'>\n$output</ul>\n" . script("mixin(qs('#logins'), {onmouseover: menuOver, onmouseout: menuOut});");
+				echo "<ul id='logins'>\n$output</ul>\n" . script("mixin(gid('logins'), {onmouseover: menuOver, onmouseout: menuOut});");
 			}
 		} else {
 			$tables = array();
@@ -1156,7 +1156,7 @@ bodyLoad('<?php echo (is_object($connection) ? preg_replace('~^(\d\.?\d).*~s', '
 
 		if ($databases) {
 			echo "<select id='database-select' name='db'>" . optionlist(["" => lang('Database')] + $databases, DB) . "</select>"
-				. script("mixin(qs('#database-select'), {onmousedown: dbMouseDown, onchange: dbChange});");
+				. script("mixin(gid('database-select'), {onmousedown: dbMouseDown, onchange: dbChange});");
 		} else {
 			echo "<input id='database-select' name='db' value='" . h(DB) . "' autocapitalize='off'>\n";
 		}
@@ -1164,7 +1164,7 @@ bodyLoad('<?php echo (is_object($connection) ? preg_replace('~^(\d\.?\d).*~s', '
 
 		if (support("scheme") && $missing != "db" && DB != "" && $connection->select_db(DB)) {
 			echo "<br><select id='scheme-select' name='ns'>" . optionlist(["" => lang('Schema')] + $adminer->schemas(), $_GET["ns"]) . "</select>"
-				. script("mixin(qs('#scheme-select'), {onmousedown: dbMouseDown, onchange: dbChange});");
+				. script("mixin(gid('scheme-select'), {onmousedown: dbMouseDown, onchange: dbChange});");
 
 			if ($_GET["ns"] != "") {
 				set_schema($_GET["ns"]);
@@ -1200,7 +1200,7 @@ bodyLoad('<?php echo (is_object($connection) ? preg_replace('~^(\d\.?\d).*~s', '
 	 * @return null
 	 */
 	function tablesPrint($tables) {
-		echo "<ul id='tables'>" . script("mixin(qs('#tables'), {onmouseover: menuOver, onmouseout: menuOut});");
+		echo "<ul id='tables'>" . script("mixin(gid('tables'), {onmouseover: menuOver, onmouseout: menuOut});");
 
 		foreach ($tables as $table => $status) {
 			$name = $this->tableName($status);
diff --git a/adminer/include/editing.inc.php b/adminer/include/editing.inc.php
index f4f56998..75ef25bb 100644
--- a/adminer/include/editing.inc.php
+++ b/adminer/include/editing.inc.php
@@ -297,7 +297,7 @@ function edit_fields(array $fields, array $collations, $type = "TABLE", $foreign
 		}
 	?>
 	<th id="label-name"><?php echo ($type == "TABLE" ? lang('Column name') : lang('Parameter name')); ?></th>
-	<td id="label-type"><?php echo lang('Type'); ?><textarea id="enum-edit" rows="4" cols="12" wrap="off" style="display: none;"></textarea><?php echo script("qs('#enum-edit').onblur = editingLengthBlur;"); ?></td>
+	<td id="label-type"><?php echo lang('Type'); ?><textarea id="enum-edit" rows="4" cols="12" wrap="off" style="display: none;"></textarea><?php echo script("gid('enum-edit').onblur = editingLengthBlur;"); ?></td>
 	<td id="label-length"><?php echo lang('Length'); ?></td>
 	<td><?php echo lang('Options'); /* no label required, options have their own label */ ?></td>
 	<?php if ($type == "TABLE") { ?>
diff --git a/adminer/include/functions.inc.php b/adminer/include/functions.inc.php
index ae46cb67..8ede5064 100644
--- a/adminer/include/functions.inc.php
+++ b/adminer/include/functions.inc.php
@@ -1599,7 +1599,7 @@ function edit_form($table, $fields, $row, $update) {
 		}
 	}
 	echo ($update ? "<input type='submit' name='delete' value='" . lang('Delete') . "'>" . confirm() . "\n"
-		: ($_POST || !$fields ? "" : script("focus(qsa('td', qs('#form'))[1].firstChild);"))
+		: ($_POST || !$fields ? "" : script("focus(qsa('td', gid('form'))[1].firstChild);"))
 	);
 	if (isset($_GET["select"])) {
 		hidden_fields(array("check" => (array) $_POST["check"], "clone" => $_POST["clone"], "all" => $_POST["all"]));
diff --git a/adminer/schema.inc.php b/adminer/schema.inc.php
index f092d88c..3ce3d63d 100644
--- a/adminer/schema.inc.php
+++ b/adminer/schema.inc.php
@@ -50,9 +50,9 @@ foreach (table_status('', true) as $table => $table_status) {
 ?>
 <div id="schema" style="height: <?php echo $top; ?>em;">
 <script<?php echo nonce(); ?>>
-qs('#schema').onselectstart = function () { return false; };
+gid('schema').onselectstart = function () { return false; };
 var tablePos = {<?php echo implode(",", $table_pos_js) . "\n"; ?>};
-var em = qs('#schema').offsetHeight / <?php echo $top; ?>;
+var em = gid('schema').offsetHeight / <?php echo $top; ?>;
 document.onmousemove = schemaMousemove;
 document.onmouseup = partialArg(schemaMouseup, '<?php echo js_escape(DB); ?>');
 </script>
@@ -61,12 +61,12 @@ foreach ($schema as $name => $table) {
 	echo "<div class='table' style='top: " . $table["pos"][0] . "em; left: " . $table["pos"][1] . "em;'>";
 	echo '<a href="' . h(ME) . 'table=' . urlencode($name) . '"><b>' . h($name) . "</b></a>";
 	echo script("qsl('div').onmousedown = schemaMousedown;");
-	
+
 	foreach ($table["fields"] as $field) {
 		$val = '<span' . type_class($field["type"]) . ' title="' . h($field["full_type"] . ($field["null"] ? " NULL" : '')) . '">' . h($field["field"]) . '</span>';
 		echo "<br>" . ($field["primary"] ? "<i>$val</i>" : $val);
 	}
-	
+
 	foreach ((array) $table["references"] as $target_name => $refs) {
 		foreach ($refs as $left => $ref) {
 			$left1 = $left - $table_pos[$name][1];
@@ -76,7 +76,7 @@ foreach ($schema as $name => $table) {
 			}
 		}
 	}
-	
+
 	foreach ((array) $referenced[$name] as $target_name => $refs) {
 		foreach ($refs as $left => $columns) {
 			$left1 = $left - $table_pos[$name][1];
@@ -86,7 +86,7 @@ foreach ($schema as $name => $table) {
 			}
 		}
 	}
-	
+
 	echo "\n</div>\n";
 }
 
diff --git a/adminer/scheme.inc.php b/adminer/scheme.inc.php
index b1774541..71c9c636 100644
--- a/adminer/scheme.inc.php
+++ b/adminer/scheme.inc.php
@@ -27,7 +27,7 @@ if (!$row) {
 
 <form action="" method="post">
 <p><input name="name" id="name" value="<?php echo h($row["name"]); ?>" autocapitalize="off">
-<?php echo script("focus(qs('#name'));"); ?>
+<?php echo script("focus(gid('name'));"); ?>
 <input type="submit" value="<?php echo lang('Save'); ?>">
 <?php
 if ($_GET["ns"] != "") {
diff --git a/adminer/select.inc.php b/adminer/select.inc.php
index a2cff4c1..4baf9b8f 100644
--- a/adminer/select.inc.php
+++ b/adminer/select.inc.php
@@ -322,10 +322,10 @@ if (!$columns && support("table")) {
 
 			echo "<div class='scrollable'>";
 			echo "<table id='table' cellspacing='0' class='nowrap checkable'>";
-			echo script("mixin(qs('#table'), {onclick: tableClick, ondblclick: partialArg(tableClick, true), onkeydown: editingKeydown});");
+			echo script("mixin(gid('table'), {onclick: tableClick, ondblclick: partialArg(tableClick, true), onkeydown: editingKeydown});");
 			echo "<thead><tr>" . (!$group && $select
 				? ""
-				: "<td><input type='checkbox' id='all-page' class='jsonly'>" . script("qs('#all-page').onclick = partial(formCheck, /check/);", "")
+				: "<td><input type='checkbox' id='all-page' class='jsonly'>" . script("gid('all-page').onclick = partial(formCheck, /check/);", "")
 					. " <a href='" . h($_GET["modify"] ? remove_from_uri("modify") : $_SERVER["REQUEST_URI"] . "&modify=1") . "'>" . lang('Modify') . "</a>");
 			$names = array();
 			$functions = array();
diff --git a/adminer/sql.inc.php b/adminer/sql.inc.php
index 3470c6bd..9cb2b098 100644
--- a/adminer/sql.inc.php
+++ b/adminer/sql.inc.php
@@ -243,7 +243,7 @@ if (!isset($_GET["import"])) {
 	}
 	echo "<p>";
 	textarea("query", $q, 20);
-	echo script(($_POST ? "" : "qs('textarea').focus();\n") . "qs('#form').onsubmit = partial(sqlSubmit, qs('#form'), '" . js_escape(remove_from_uri("sql|limit|error_stops|only_errors|history")) . "');");
+	echo script(($_POST ? "" : "qs('textarea').focus();\n") . "gid('form').onsubmit = partial(sqlSubmit, gid('form'), '" . js_escape(remove_from_uri("sql|limit|error_stops|only_errors|history")) . "');");
 	echo "<p>$execute\n";
 	echo lang('Limit rows') . ": <input type='number' name='limit' class='size' value='" . h($_POST ? $_POST["limit"] : $_GET["limit"]) . "'>\n";
 
diff --git a/adminer/static/editing.js b/adminer/static/editing.js
index be65a621..2ab06749 100644
--- a/adminer/static/editing.js
+++ b/adminer/static/editing.js
@@ -88,13 +88,17 @@ function messagesPrint(el) {
 
 
 
-/** Hide or show some login rows for selected driver
-* @param HTMLSelectElement
-*/
-function loginDriver(driver) {
-	var trs = parentTag(driver, 'table').rows;
-	var disabled = /sqlite/.test(selectValue(driver));
-	alterClass(trs[1], 'hidden', disabled);	// 1 - row with server
+/**
+ * Hides or shows some login rows for selected driver.
+ *
+ * @param {HTMLSelectElement} driverSelect
+ */
+function loginDriver(driverSelect) {
+	const trs = parentTag(driverSelect, 'table').rows;
+	const disabled = /sqlite/.test(selectValue(driverSelect));
+
+	// 1 - row with server
+	trs[1].classList.toggle('hidden', disabled);
 	trs[1].getElementsByTagName('input')[0].disabled = disabled;
 }
 
@@ -251,7 +255,7 @@ function editFields() {
 * @return boolean false to cancel action
 */
 function editingClick(event) {
-	var el = getTarget(event);
+	var el = event.target;
 	if (!isTag(el, 'input')) {
 		el = parentTag(el, 'label');
 		el = el && qs('input', el);
@@ -280,7 +284,7 @@ function editingClick(event) {
 * @param InputEvent
 */
 function editingInput(event) {
-	var el = getTarget(event);
+	var el = event.target;
 	if (/\[default]$/.test(el.name)) {
 		 el.previousSibling.checked = true;
 	}
@@ -405,16 +409,17 @@ function editingTypeChange() {
 			el.checked = false;
 		}
 		if (el.name === name + '[collation]') {
-			alterClass(el, 'hidden', !/(char|text|enum|set)$/.test(text));
+			el.classList.toggle('hidden', !/(char|text|enum|set)$/.test(text));
 		}
 		if (el.name === name + '[unsigned]') {
-			alterClass(el, 'hidden', !/(^|[^o])int(?!er)|numeric|real|float|double|decimal|money/.test(text));
+			el.classList.toggle('hidden', !/(^|[^o])int(?!er)|numeric|real|float|double|decimal|money/.test(text));
 		}
 		if (el.name === name + '[on_update]') {
-			alterClass(el, 'hidden', !/timestamp|datetime/.test(text)); // MySQL supports datetime since 5.6.5
+			// MySQL supports datetime since 5.6.5.
+			el.classList.toggle('hidden', !/timestamp|datetime/.test(text));
 		}
 		if (el.name === name + '[on_delete]') {
-			alterClass(el, 'hidden', !/`/.test(text));
+			el.classList.toggle('hidden', !/`/.test(text));
 		}
 	}
 }
@@ -423,7 +428,7 @@ function editingTypeChange() {
 * @this HTMLInputElement
 */
 function editingLengthChange() {
-	alterClass(this, 'required', !this.value.length && /var(char|binary)$/.test(selectValue(this.parentNode.previousSibling.firstChild)));
+	this.classList.toggle('required', !this.value.length && /var(char|binary)$/.test(selectValue(this.parentNode.previousSibling.firstChild)));
 }
 
 /** Edit enum or set
@@ -432,7 +437,7 @@ function editingLengthChange() {
 function editingLengthFocus() {
 	var td = this.parentNode;
 	if (/(enum|set)$/.test(selectValue(td.previousSibling.firstChild))) {
-		var edit = qs('#enum-edit');
+		var edit = gid('enum-edit');
 		edit.value = enumValues(this.value);
 		td.appendChild(edit);
 		this.style.display = 'none';
@@ -476,9 +481,9 @@ function editingLengthBlur() {
 * @param number
 */
 function columnShow(checked, column) {
-	var trs = qsa('tr', qs('#edit-fields'));
+	var trs = qsa('tr', gid('edit-fields'));
 	for (var i=0; i < trs.length; i++) {
-		alterClass(qsa('td', trs[i])[column], 'hidden', !checked);
+		qsa('td', trs[i])[column].classList.toggle('hidden', !checked);
 	}
 }
 
@@ -487,8 +492,9 @@ function columnShow(checked, column) {
 */
 function partitionByChange() {
 	var partitionTable = /RANGE|LIST/.test(selectValue(this));
-	alterClass(this.form['partitions'], 'hidden', partitionTable || !this.selectedIndex);
-	alterClass(qs('#partition-table'), 'hidden', !partitionTable);
+
+	this.form['partitions'].classList.toggle('hidden', partitionTable || !this.selectedIndex);
+	gid('partition-table').classList.toggle('hidden', !partitionTable);
 }
 
 /** Add next partition row
@@ -508,7 +514,7 @@ function partitionNameChange() {
 function editingCommentsClick(el, focus) {
 	var comment = el.form['Comment'];
 	columnShow(el.checked, 6);
-	alterClass(comment, 'hidden', !el.checked);
+	comment.classList.toggle('hidden', !el.checked);
 	if (focus && el.checked) {
 		comment.focus();
 	}
@@ -521,7 +527,7 @@ function editingCommentsClick(el, focus) {
 * @this HTMLTableElement
 */
 function dumpClick(event) {
-	var el = parentTag(getTarget(event), 'label');
+	var el = parentTag(event.target, 'label');
 	if (el) {
 		el = qs('input', el);
 		var match = /(.+)\[]$/.exec(el.name);
@@ -651,7 +657,7 @@ function triggerChange(tableRe, table, form) {
 	if (tableRe.test(form['Trigger'].value)) {
 		form['Trigger'].value = table + '_' + (selectValue(form['Timing']).charAt(0) + formEvent.charAt(0)).toLowerCase();
 	}
-	alterClass(form['Of'], 'hidden', !/ OF/.test(formEvent));
+	form['Of'].classList.toggle('hidden', !/ OF/.test(formEvent));
 }
 
 
@@ -725,7 +731,7 @@ function schemaMouseup(event, db) {
 			s += '_' + key + ':' + Math.round(tablePos[key][0] * 10000) / 10000 + 'x' + Math.round(tablePos[key][1] * 10000) / 10000;
 		}
 		s = encodeURIComponent(s.substr(1));
-		var link = qs('#schema-link');
+		var link = gid('schema-link');
 		link.href = link.href.replace(/[^=]+$/, '') + s;
 		cookie('adminer_schema-' + db + '=' + s, 30); //! special chars in db
 	}
diff --git a/adminer/static/functions.js b/adminer/static/functions.js
index 3cc6cc61..ff420020 100644
--- a/adminer/static/functions.js
+++ b/adminer/static/functions.js
@@ -73,17 +73,6 @@ function mixin(target, source) {
 	}
 }
 
-/** Add or remove CSS class
-* @param HTMLElement
-* @param string
-* @param [bool]
-*/
-function alterClass(el, className, enable) {
-	if (el) {
-		el.className = el.className.replace(RegExp('(^|\\s)' + className + '(\\s|$)'), '$2') + (enable ? ' ' + className : '');
-	}
-}
-
 /**
  * Toggles visibility of element with ID.
  *
@@ -129,7 +118,7 @@ function verifyVersion(currentVersion, baseUrl, token) {
 		ajax(baseUrl + 'script=version', function () {}, data);
 
 		if (currentVersion !== version) {
-			qs('#version').innerText = version;
+			gid('version').innerText = version;
 		}
 	});
 }
@@ -173,7 +162,7 @@ function parentTag(el, tag) {
 */
 function trCheck(el) {
 	var tr = parentTag(el, 'tr');
-	alterClass(tr, 'checked', el.checked);
+	tr.classList.toggle('checked', el.checked);
 	if (el.form && el.form['all'] && el.form['all'].onclick) { // Opera treats form.all as document.all
 		el.form['all'].onclick();
 	}
@@ -186,7 +175,7 @@ function trCheck(el) {
 */
 function selectCount(id, count) {
 	setHtml(id, (count === '' ? '' : '(' + (count + '').replace(/\B(?=(\d{3})+$)/g, thousandsSeparator) + ')'));
-	var el = qs('#' + id);
+	var el = gid(id);
 	if (el) {
 		var inputs = qsa('input', el.parentNode.parentNode);
 		for (var i = 0; i < inputs.length; i++) {
@@ -259,7 +248,7 @@ function formChecked(el, name) {
 * @param [boolean] force click
 */
 function tableClick(event, click) {
-	var td = parentTag(getTarget(event), 'td');
+	var td = parentTag(event.target, 'td');
 	var text;
 	if (td && (text = td.getAttribute('data-text'))) {
 		if (selectClick.call(td, event, +text, td.getAttribute('data-warning'))) {
@@ -267,7 +256,7 @@ function tableClick(event, click) {
 		}
 	}
 	click = (click || !window.getSelection || getSelection().isCollapsed);
-	var el = getTarget(event);
+	var el = event.target;
 	while (!isTag(el, 'tr')) {
 		if (isTag(el, 'table|a|input|textarea')) {
 			if (el.type !== 'checkbox') {
@@ -374,7 +363,7 @@ function initTablesFilter(dbName) {
 	if (sessionStorage) {
 		document.addEventListener('DOMContentLoaded', function () {
 			if (dbName === sessionStorage.getItem('adminer_tables_filter_db') && sessionStorage.getItem('adminer_tables_filter')) {
-				qs('#tables-filter').value = sessionStorage.getItem('adminer_tables_filter');
+				gid('tables-filter').value = sessionStorage.getItem('adminer_tables_filter');
 				filterTables();
 			} else {
 				sessionStorage.removeItem('adminer_tables_filter');
@@ -384,7 +373,7 @@ function initTablesFilter(dbName) {
 		});
 	}
 
-	const filterInput = qs('#tables-filter');
+	const filterInput = gid('tables-filter');
 	filterInput.addEventListener('input', function () {
 		window.clearTimeout(tablesFilterTimeout);
 		tablesFilterTimeout = window.setTimeout(filterTables, 200);
@@ -401,7 +390,7 @@ function initTablesFilter(dbName) {
 }
 
 function filterTables() {
-	const value = qs('#tables-filter').value.toLowerCase();
+	const value = gid('tables-filter').value.toLowerCase();
 	if (value === tablesFilterValue) {
 		return;
 	}
@@ -445,7 +434,7 @@ function filterTables() {
 * @this HTMLElement
 */
 function menuOver(event) {
-	var a = getTarget(event);
+	var a = event.target;
 	if (isTag(a, 'a|span') && a.offsetLeft + a.offsetWidth > a.parentNode.offsetWidth - 15) { // 15 - ellipsis
 		this.style.overflow = 'visible';
 	}
@@ -717,7 +706,7 @@ function columnMouse(className) {
 * @return boolean false
 */
 function selectSearch(name) {
-	var el = qs('#fieldset-search');
+	var el = gid('fieldset-search');
 	el.className = '';
 	var divs = qsa('div', el);
 	for (var i=0; i < divs.length; i++) {
@@ -744,16 +733,6 @@ function isCtrl(event) {
 	return (event.ctrlKey || event.metaKey) && !event.altKey; // shiftKey allowed
 }
 
-/** Return event target
-* @param Event
-* @return HTMLElement
-*/
-function getTarget(event) {
-	return event.target || event.srcElement;
-}
-
-
-
 /** Send form by Ctrl+Enter on <select> and <textarea>
 * @param KeyboardEvent
 * @param [string]
@@ -761,7 +740,7 @@ function getTarget(event) {
 */
 function bodyKeydown(event, button) {
 	eventStop(event);
-	var target = getTarget(event);
+	var target = event.target;
 	if (target.jushTextarea) {
 		target = target.jushTextarea;
 	}
@@ -785,7 +764,7 @@ function bodyKeydown(event, button) {
 * @param MouseEvent
 */
 function bodyClick(event) {
-	var target = getTarget(event);
+	var target = event.target;
 	if ((isCtrl(event) || event.shiftKey) && target.type === 'submit' && isTag(target, 'input')) {
 		target.form.target = '_blank';
 		setTimeout(function () {
@@ -803,7 +782,7 @@ function bodyClick(event) {
 */
 function editingKeydown(event) {
 	if ((event.keyCode === 40 || event.keyCode === 38) && isCtrl(event)) { // 40 - Down, 38 - Up
-		var target = getTarget(event);
+		var target = event.target;
 		var sibling = (event.keyCode === 40 ? 'nextSibling' : 'previousSibling');
 		var el = target.parentNode.parentNode[sibling];
 		if (el && (isTag(el, 'tr') || (el = el[sibling])) && isTag(el, 'tr') && (el = el.childNodes[nodePosition(target.parentNode)]) && (el = el.childNodes[nodePosition(target)])) {
@@ -901,7 +880,7 @@ function fieldChange() {
 function ajax(url, callback, data, message) {
 	var request = (window.XMLHttpRequest ? new XMLHttpRequest() : (window.ActiveXObject ? new ActiveXObject('Microsoft.XMLHTTP') : false));
 	if (request) {
-		var ajaxStatus = qs('#ajaxstatus');
+		var ajaxStatus = gid('ajaxstatus');
 		if (message) {
 			ajaxStatus.innerHTML = '<div class="message">' + message + '</div>';
 			ajaxStatus.className = ajaxStatus.className.replace(/ hidden/g, '');
@@ -971,9 +950,9 @@ function ajaxForm(form, message, button) {
 	return ajax(url, function (request) {
 		setHtml('ajaxstatus', request.responseText);
 		if (window.jush) {
-			jush.highlight_tag(qsa('code', qs('#ajaxstatus')), 0);
+			jush.highlight_tag(qsa('code', gid('ajaxstatus')), 0);
 		}
-		messagesPrint(qs('#ajaxstatus'));
+		messagesPrint(gid('ajaxstatus'));
 	}, data, message);
 }
 
@@ -988,7 +967,7 @@ function ajaxForm(form, message, button) {
 */
 function selectClick(event, text, warning) {
 	var td = this;
-	var target = getTarget(event);
+	var target = event.target;
 	if (!isCtrl(event) || isTag(td.firstChild, 'input|textarea') || isTag(target, 'a')) {
 		return;
 	}
@@ -1075,7 +1054,7 @@ function selectLoadMore(limit, loading) {
 		return !ajax(href, function (request) {
 			var tbody = document.createElement('tbody');
 			tbody.innerHTML = request.responseText;
-			qs('#table').appendChild(tbody);
+			gid('table').appendChild(tbody);
 			if (tbody.children.length < limit) {
 				a.parentNode.removeChild(a);
 			} else {
@@ -1129,9 +1108,9 @@ function setupSubmitHighlightInput(input) {
 * @this HTMLInputElement
 */
 function inputFocus() {
-	var submit = findDefaultSubmit(this);
+	const submit = findDefaultSubmit(this);
 	if (submit) {
-		alterClass(submit, 'default', true);
+		submit.classList.toggle('default', true);
 	}
 }
 
@@ -1139,9 +1118,9 @@ function inputFocus() {
 * @this HTMLInputElement
 */
 function inputBlur() {
-	var submit = findDefaultSubmit(this);
+	const submit = findDefaultSubmit(this);
 	if (submit) {
-		alterClass(submit, 'default');
+		submit.classList.toggle('default', false);
 	}
 }
 
@@ -1223,7 +1202,9 @@ function getOffsetLeft(element) {
 }
 
 oninput = function (event) {
-	var target = event.target;
-	var maxLength = target.getAttribute('data-maxlength');
-	alterClass(target, 'maxlength', target.value && maxLength != null && target.value.length > maxLength); // maxLength could be 0
+	const target = event.target;
+	const maxLength = target.getAttribute('data-maxlength');
+
+	// maxLength could be 0
+	target.classList.toggle('maxlength', target.value && maxLength != null && target.value.length > maxLength);
 };
diff --git a/adminer/trigger.inc.php b/adminer/trigger.inc.php
index 4c780cb0..4450c41d 100644
--- a/adminer/trigger.inc.php
+++ b/adminer/trigger.inc.php
@@ -40,7 +40,7 @@ page_header(($name != "" ? lang('Alter trigger') . ": " . h($name) : lang('Creat
 <tr><th><?php echo lang('Type'); ?><td><?php echo html_select("Type", $trigger_options["Type"], $row["Type"]); ?>
 </table>
 <p><?php echo lang('Name'); ?>: <input name="Trigger" value="<?php echo h($row["Trigger"]); ?>" data-maxlength="64" autocapitalize="off">
-<?php echo script("qs('#form')['Timing'].onchange();"); ?>
+<?php echo script("gid('form')['Timing'].onchange();"); ?>
 <p><?php textarea("Statement", $row["Statement"]); ?>
 <p>
 <input type="submit" value="<?php echo lang('Save'); ?>">
diff --git a/adminer/user.inc.php b/adminer/user.inc.php
index 8180d257..e8c02508 100644
--- a/adminer/user.inc.php
+++ b/adminer/user.inc.php
@@ -142,7 +142,7 @@ if ($_POST) {
 <tr><th><?php echo lang('Server'); ?><td><input name="host" data-maxlength="60" value="<?php echo h($row["host"]); ?>" autocapitalize="off">
 <tr><th><?php echo lang('Username'); ?><td><input name="user" data-maxlength="80" value="<?php echo h($row["user"]); ?>" autocapitalize="off">
 <tr><th><?php echo lang('Password'); ?><td><input name="pass" id="pass" value="<?php echo h($row["pass"]); ?>" autocomplete="new-password">
-<?php if (!$row["hashed"]) { echo script("typePassword(qs('#pass'));"); } ?>
+<?php if (!$row["hashed"]) { echo script("typePassword(gid('pass'));"); } ?>
 <?php echo (min_version(8) ? "" : checkbox("hashed", 1, $row["hashed"], lang('Hashed'), "typePassword(this.form['pass'], this.checked);")); ?>
 </table>
 
diff --git a/editor/db.inc.php b/editor/db.inc.php
index 6657a1b5..8beadee7 100644
--- a/editor/db.inc.php
+++ b/editor/db.inc.php
@@ -11,11 +11,11 @@ if ($adminer->homepage()) {
 	echo "<table cellspacing='0' class='nowrap checkable'>\n";
 	echo script("mixin(qsl('table'), {onclick: tableClick, ondblclick: partialArg(tableClick, true)});");
 	echo '<thead><tr class="wrap">';
-	echo '<td><input id="check-all" type="checkbox" class="jsonly">' . script("qs('#check-all').onclick = partial(formCheck, /^tables\[/);", "");
+	echo '<td><input id="check-all" type="checkbox" class="jsonly">' . script("gid('check-all').onclick = partial(formCheck, /^tables\[/);", "");
 	echo '<th>' . lang('Table');
 	echo '<td>' . lang('Rows');
 	echo "</thead>\n";
-	
+
 	foreach (table_status() as $table => $row) {
 		$name = $adminer->tableName($row);
 		if (isset($row["Engine"]) && $name != "") {
@@ -25,7 +25,7 @@ if ($adminer->homepage()) {
 			echo "<td align='right'><a href='" . h(ME . "edit=") . urlencode($table) . "'>" . ($row["Engine"] == "InnoDB" && $val ? "~ $val" : $val) . "</a>";
 		}
 	}
-	
+
 	echo "</table>\n";
 	echo "</div>\n";
 	echo "</form>\n";
diff --git a/editor/include/adminer.inc.php b/editor/include/adminer.inc.php
index 13dc45cc..8cf08838 100644
--- a/editor/include/adminer.inc.php
+++ b/editor/include/adminer.inc.php
@@ -77,7 +77,7 @@ class Adminer {
 
 	function loginForm() {
 		echo "<table cellspacing='0' class='layout'>\n";
-		echo $this->loginFormField('username', '<tr><th>' . lang('Username') . '<td>', '<input type="hidden" name="auth[driver]" value="server"><input name="auth[username]" id="username" value="' . h($_GET["username"]) . '" autocomplete="username" autocapitalize="off">' . script("focus(qs('#username'));"));
+		echo $this->loginFormField('username', '<tr><th>' . lang('Username') . '<td>', '<input type="hidden" name="auth[driver]" value="server"><input name="auth[username]" id="username" value="' . h($_GET["username"]) . '" autocomplete="username" autocapitalize="off">' . script("focus(gid('username'));"));
 		echo $this->loginFormField('password', '<tr><th>' . lang('Password') . '<td>', '<input type="password" name="auth[password]" autocomplete="current-password">' . "\n");
 		echo "</table>\n";
 		echo "<p><input type='submit' value='" . lang('Login') . "'>\n";
@@ -620,7 +620,7 @@ qsl('div').onclick = whisperClick;", "")
 					if ($password !== null) {
 						if ($first) {
 							echo "<ul id='logins'>";
-							echo script("mixin(qs('#logins'), {onmouseover: menuOver, onmouseout: menuOut});");
+							echo script("mixin(gid('logins'), {onmouseover: menuOver, onmouseout: menuOut});");
 							$first = false;
 						}
 						echo "<li><a href='" . h(auth_url($vendor, "", $username)) . "'>" . ($username != "" ? h($username) : "<i>" . lang('empty') . "</i>") . "</a>\n";
@@ -655,7 +655,7 @@ qsl('div').onclick = whisperClick;", "")
 	}
 
 	function tablesPrint($tables) {
-		echo "<ul id='tables'>" . script("mixin(qs('#tables'), {onmouseover: menuOver, onmouseout: menuOut});");
+		echo "<ul id='tables'>" . script("mixin(gid('tables'), {onmouseover: menuOver, onmouseout: menuOut});");
 
 		foreach ($tables as $row) {
 			// Skip views and tables without a name.
diff --git a/editor/static/editing.js b/editor/static/editing.js
index 497d5dbb..c6752a5a 100644
--- a/editor/static/editing.js
+++ b/editor/static/editing.js
@@ -43,7 +43,7 @@ function whisper(url) {
 */
 function whisperClick(event) {
 	var field = this.previousSibling;
-	var el = getTarget(event);
+	var el = event.target;
 	if (isTag(el, 'a') && !(event.button || event.shiftKey || event.altKey || isCtrl(event))) {
 		field.value = el.firstChild.data;
 		field.previousSibling.value = decodeURIComponent(el.href.replace(/.*=/, ''));
diff --git a/plugins/tinymce.php b/plugins/tinymce.php
index a6cad006..027da878 100644
--- a/plugins/tinymce.php
+++ b/plugins/tinymce.php
@@ -65,7 +65,7 @@ tinyMCE.init({
 			return "<textarea$attrs id='fields-" . h($field["field"]) . "' rows='12' cols='50'>" . h($value) . "</textarea>" . script("
 tinyMCE.remove(tinyMCE.get('fields-" . js_escape($field["field"]) . "') || { });
 tinyMCE.EditorManager.execCommand('mceAddControl', true, 'fields-" . js_escape($field["field"]) . "');
-qs('#form').onsubmit = function () {
+gid('form').onsubmit = function () {
 	tinyMCE.each(tinyMCE.editors, function (ed) {
 		ed.remove();
 	});