diff --git a/adminer/create.inc.php b/adminer/create.inc.php
index 0224c872..6574e83d 100644
--- a/adminer/create.inc.php
+++ b/adminer/create.inc.php
@@ -183,7 +183,7 @@ foreach ($engines as $engine) {
 <?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 echo ($engines ? "<select name='Engine'>" . optionlist(array("" => "(" . lang('engine') . ")") + $engines, $row["Engine"]) . "</select>" . on_help("getTarget(event).value", 1) . script("qsl('select').onchange = helpClose;") : ""); ?>
+<?php echo ($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'); ?>">
 <?php } ?>
@@ -221,7 +221,7 @@ if (support("partitioning")) {
 	print_fieldset("partition", lang('Partition by'), $row["partition_by"]);
 	?>
 <p>
-<?php echo "<select name='partition_by'>" . optionlist(array("" => "") + $partition_by, $row["partition_by"]) . "</select>" . on_help("getTarget(event).value.replace(/./, 'PARTITION BY \$&')", 1) . script("qsl('select').onchange = partitionByChange;"); ?>
+<?php echo "<select name='partition_by'>" . optionlist(array("" => "") + $partition_by, $row["partition_by"]) . "</select>" . help_script_command("value.replace(/./, 'PARTITION BY \$&')", true) . script("qsl('select').onchange = partitionByChange;"); ?>
 (<input name="partition" value="<?php echo h($row["partition"]); ?>">)
 <?php echo lang('Partitions'); ?>: <input type="number" name="partitions" class="size<?php echo ($partition_table || !$row["partition_by"] ? " hidden" : ""); ?>" value="<?php echo h($row["partitions"]); ?>">
 <table cellspacing="0" id="partition-table"<?php echo ($partition_table ? "" : " class='hidden'"); ?>>
diff --git a/adminer/db.inc.php b/adminer/db.inc.php
index 67735e4c..f07938e6 100644
--- a/adminer/db.inc.php
+++ b/adminer/db.inc.php
@@ -147,17 +147,17 @@ if ($adminer->homepage()) {
 			echo "</div>\n";
 			if (!information_schema(DB)) {
 				echo "<div class='footer'><div>\n";
-				$vacuum = "<input type='submit' value='" . lang('Vacuum') . "'> " . on_help("'VACUUM'");
-				$optimize = "<input type='submit' name='optimize' value='" . lang('Optimize') . "'> " . on_help($jush == "sql" ? "'OPTIMIZE TABLE'" : "'VACUUM OPTIMIZE'");
+				$vacuum = "<input type='submit' value='" . lang('Vacuum') . "'> " . help_script("VACUUM");
+				$optimize = "<input type='submit' name='optimize' value='" . lang('Optimize') . "'> " . help_script($jush == "sql" ? "OPTIMIZE TABLE" : "VACUUM OPTIMIZE");
 				echo "<fieldset><legend>" . lang('Selected') . " <span id='selected'></span></legend><div>"
 				. ($jush == "sqlite" ? $vacuum
 				: ($jush == "pgsql" ? $vacuum . $optimize
-				: ($jush == "sql" ? "<input type='submit' value='" . lang('Analyze') . "'> " . on_help("'ANALYZE TABLE'") . $optimize
-					. "<input type='submit' name='check' value='" . lang('Check') . "'> " . on_help("'CHECK TABLE'")
-					. "<input type='submit' name='repair' value='" . lang('Repair') . "'> " . on_help("'REPAIR TABLE'")
+				: ($jush == "sql" ? "<input type='submit' value='" . lang('Analyze') . "'> " . help_script("ANALYZE TABLE") . $optimize
+					. "<input type='submit' name='check' value='" . lang('Check') . "'> " . help_script("CHECK TABLE")
+					. "<input type='submit' name='repair' value='" . lang('Repair') . "'> " . help_script("REPAIR TABLE")
 				: "")))
-				. "<input type='submit' name='truncate' value='" . lang('Truncate') . "'> " . on_help($jush == "sqlite" ? "'DELETE'" : "'TRUNCATE" . ($jush == "pgsql" ? "'" : " TABLE'")) . confirm()
-				. "<input type='submit' name='drop' value='" . lang('Drop') . "'>" . on_help("'DROP TABLE'") . confirm() . "\n";
+				. "<input type='submit' name='truncate' value='" . lang('Truncate') . "'> " . help_script($jush == "sqlite" ? "DELETE" : ("TRUNCATE" . ($jush == "pgsql" ? "" : " TABLE"))) . confirm()
+				. "<input type='submit' name='drop' value='" . lang('Drop') . "'>" . help_script("DROP TABLE") . confirm() . "\n";
 				$databases = (support("scheme") ? $adminer->schemas() : $adminer->databases());
 				if (count($databases) != 1 && $jush != "sqlite") {
 					$db = (isset($_POST["target"]) ? $_POST["target"] : (support("scheme") ? $_GET["ns"] : DB));
diff --git a/adminer/include/adminer.inc.php b/adminer/include/adminer.inc.php
index dc1084c7..a0002660 100644
--- a/adminer/include/adminer.inc.php
+++ b/adminer/include/adminer.inc.php
@@ -424,8 +424,8 @@ class Adminer {
 				echo "<select name='columns[$i][fun]'>",
 					optionlist([-1 => ""] + array_filter([lang('Functions') => $functions, lang('Aggregation') => $grouping]), $val["fun"]),
 					"</select>",
-					on_help("getTarget(event).value && getTarget(event).value.replace(/ |\$/, '(') + ')'", 1),
-					script("qsl('select').onchange = (event) => { helpClose();" . ($key !== "" ? "" : " qsl('select, input:not(.remove)', event.target.parentNode).onchange();") . " };", ""),
+					help_script_command("value && value.replace(/ |\$/, '(') + ')'", true),
+					script("qsl('select').onchange = (event) => { " . ($key !== "" ? "" : " qsl('select, input:not(.remove)', event.target.parentNode).onchange();") . " };", ""),
 					"($column)";
 			} else {
 				echo $column;
diff --git a/adminer/include/design.inc.php b/adminer/include/design.inc.php
index 2a53d367..fb0be61b 100644
--- a/adminer/include/design.inc.php
+++ b/adminer/include/design.inc.php
@@ -54,7 +54,7 @@ function page_header($title, $error = "", $breadcrumb = [], $title2 = "") {
 </script>
 
 <div id="help" class="jush-<?php echo $jush; ?> jsonly hidden"></div>
-<?php echo script("mixin(qs('#help'), {onmouseover: function () { helpOpen = 1; }, onmouseout: helpMouseout});"); ?>
+<?php echo script("initHelpPopup();"); ?>
 
 <div id="content">
 <?php
diff --git a/adminer/include/functions.inc.php b/adminer/include/functions.inc.php
index c6248716..ae46cb67 100644
--- a/adminer/include/functions.inc.php
+++ b/adminer/include/functions.inc.php
@@ -967,7 +967,7 @@ function input($field, $value, $function) {
 		$has_function = (in_array($function, $functions) || isset($functions[$function]));
 		echo (count($functions) > 1
 			? "<select name='function[$name]' $disabled>" . optionlist($functions, $function === null || $has_function ? $function : "") . "</select>"
-				. on_help("getTarget(event).value.replace(/^SQL\$/, '')", 1)
+				. help_script_command("value.replace(/^SQL\$/, '')", true)
 				. script("qsl('select').onchange = functionChange;", "")
 			: h(reset($functions))
 		) . '<td>';
@@ -1486,13 +1486,26 @@ function lzw_decompress($binary) {
 	return $return;
 }
 
-/** Return events to display help on mouse over
-* @param string JS expression
-* @param bool JS expression
-* @return string
-*/
-function on_help($command, $side = 0) {
-	return script("mixin(qsl('select, input'), {onmouseover: function (event) { helpMouseover.call(this, event, $command, $side) }, onmouseout: helpMouseout});", "");
+/**
+ * @param string $text Help text.
+ * @param bool $side Side position.
+ *
+ * @return string
+ */
+function help_script($text, $side = false)
+{
+	return script("initHelpFor(qsl('select, input'), '" . h($text) . "', $side);", "");
+}
+
+/**
+ * @param string $command JS expression for returning the help text.
+ * @param bool $side Side position.
+ *
+ * @return string
+ */
+function help_script_command($command, $side = false)
+{
+	return script("initHelpFor(qsl('select, input'), (value) => { return $command; }, $side);", "");
 }
 
 /** Print edit data form
diff --git a/adminer/static/editing.js b/adminer/static/editing.js
index 75d0ac97..be65a621 100644
--- a/adminer/static/editing.js
+++ b/adminer/static/editing.js
@@ -236,11 +236,13 @@ function editFields() {
 	els = qsa('[name$="[type]"]');
 	for (var i = 0; i < els.length; i++) {
 		mixin(els[i], {
-			onfocus: function () { lastType = selectValue(this); },
+			onfocus: () => {
+				lastType = selectValue(this);
+			},
 			onchange: editingTypeChange,
-			onmouseover: function (event) { helpMouseover.call(this, event, getTarget(event).value, 1) },
-			onmouseout: helpMouseout
 		});
+
+		initHelpFor(els[i], (value) => { return value; }, true);
 	}
 }
 
@@ -415,7 +417,6 @@ function editingTypeChange() {
 			alterClass(el, 'hidden', !/`/.test(text));
 		}
 	}
-	helpClose();
 }
 
 /** Mark length as required
@@ -488,7 +489,6 @@ function partitionByChange() {
 	var partitionTable = /RANGE|LIST/.test(selectValue(this));
 	alterClass(this.form['partitions'], 'hidden', partitionTable || !this.selectedIndex);
 	alterClass(qs('#partition-table'), 'hidden', !partitionTable);
-	helpClose();
 }
 
 /** Add next partition row
@@ -732,48 +732,107 @@ function schemaMouseup(event, db) {
 }
 
 
+// Help.
+(function() {
+	let openTimeout = null;
+	let closeTimeout = null;
+	let helpVisible = false;
 
-var helpOpen, helpIgnore; // when mouse outs <option> then it mouse overs border of <select> - ignore it
+	window.initHelpPopup = function () {
+		const help = gid("help");
 
-/** Display help
-* @param MouseEvent
-* @param string
-* @param bool display on left side (otherwise on top)
-* @this HTMLElement
-*/
-function helpMouseover(event, text, side) {
-	var target = getTarget(event);
-	if (!text) {
-		helpClose();
-	} else if (window.jush && (!helpIgnore || this !== target)) {
-		helpOpen = 1;
-		var help = qs('#help');
-		help.innerHTML = text;
-		jush.highlight_tag([ help ]);
-		alterClass(help, 'hidden');
-		var rect = target.getBoundingClientRect();
-		var body = document.documentElement;
-		help.style.top = (body.scrollTop + rect.top - (side ? (help.offsetHeight - target.offsetHeight) / 2 : help.offsetHeight)) + 'px';
-		help.style.left = (body.scrollLeft + rect.left - (side ? help.offsetWidth : (help.offsetWidth - target.offsetWidth) / 2)) + 'px';
-	}
-}
+		help.addEventListener("mouseenter", () => {
+			clearTimeout(closeTimeout);
+			closeTimeout = null;
+		});
 
-/** Close help after timeout
-* @param MouseEvent
-* @this HTMLElement
-*/
-function helpMouseout(event) {
-	helpOpen = 0;
-	helpIgnore = (this !== getTarget(event));
-	setTimeout(function () {
-		if (!helpOpen) {
-			helpClose();
+		help.addEventListener("mouseleave", hideHelp);
+	};
+
+	/**
+	 * @param {HTMLElement} element
+	 * @param {string|function} content
+	 * @param {boolean} side Displays on left side (otherwise on top).
+	 */
+	window.initHelpFor = function(element, content, side = false) {
+		const withCallback = typeof content === "function";
+
+		element.addEventListener("mouseenter", (event) => {
+			showHelp(event.target, withCallback ? content(event.target.value) : content, side)
+		});
+
+		element.addEventListener("mouseleave", hideHelp);
+		element.addEventListener("blur", hideHelp);
+
+		if (withCallback) {
+			element.addEventListener("change", hideHelp);
 		}
-	}, 200);
-}
+	};
 
-/** Close help
-*/
-function helpClose() {
-	alterClass(qs('#help'), 'hidden', true);
-}
+	/**
+	 * Displays help popup after a small delay.
+	 *
+	 * @param {HTMLElement} element
+	 * @param {string} text
+	 * @param {boolean} side display on left side (otherwise on top)
+	 */
+	function showHelp(element, text, side) {
+		if (!text) {
+			hideHelp();
+			return;
+		}
+
+		if (isSorting() || !window.jush) {
+			return;
+		}
+
+		clearTimeout(openTimeout);
+		openTimeout = null;
+		clearTimeout(closeTimeout);
+		closeTimeout = null;
+
+		const help = gid("help");
+		help.innerHTML = text;
+		jush.highlight_tag([help]);
+
+		// Display help briefly to calculate position properly.
+		help.classList.remove("hidden");
+
+		const rect = element.getBoundingClientRect();
+		const root = document.documentElement;
+
+		help.style.top = (root.scrollTop + rect.top - (side ? (help.offsetHeight - element.offsetHeight) / 2 : help.offsetHeight)) + 'px';
+		help.style.left = (root.scrollLeft + rect.left - (side ? help.offsetWidth : (help.offsetWidth - element.offsetWidth) / 2)) + 'px';
+
+		if (helpVisible) {
+			return;
+		}
+
+		help.classList.add("hidden");
+
+		openTimeout = setTimeout(() => {
+			gid("help").classList.remove("hidden");
+
+			helpVisible = true;
+			openTimeout = null;
+		}, 600);
+	}
+
+	/**
+	 * Closes the help popup after a small delay.
+	 */
+	function hideHelp() {
+		if (openTimeout) {
+			clearTimeout(openTimeout);
+			openTimeout = null;
+			return;
+		}
+
+		closeTimeout = setTimeout(() => {
+			gid("help").classList.add("hidden");
+
+			helpVisible = false;
+			closeTimeout = null;
+		}, 200);
+	}
+})();
diff --git a/adminer/static/functions.js b/adminer/static/functions.js
index bed8d848..3cc6cc61 100644
--- a/adminer/static/functions.js
+++ b/adminer/static/functions.js
@@ -544,13 +544,13 @@ function selectSearchSearch() {
 
 // Sorting.
 (function() {
-	let placeholderRow, nextRow, dragHelper;
+	let placeholderRow = null, nextRow = null, dragHelper = null;
 	let startY, minY, maxY;
 
 	/**
 	 * Initializes sortable list of DIV elements.
 	 *
-	 * @param {string} parentId
+	 * @param {string} parentSelector
 	 */
 	window.initSortable = function(parentSelector) {
 		const parent = qs(parentSelector);
@@ -576,6 +576,10 @@ function selectSearchSearch() {
 		handle.addEventListener("touchstart", (event) => { startSorting(row, event) });
 	};
 
+	window.isSorting = function () {
+		return dragHelper !== null;
+	};
+
 	function startSorting(row, event) {
 		event.preventDefault();
 
@@ -670,6 +674,8 @@ function selectSearchSearch() {
 		placeholderRow.parentNode.insertBefore(dragHelper.tagName === "TABLE" ? dragHelper.firstChild : dragHelper, placeholderRow);
 		placeholderRow.remove();
 
+		placeholderRow = nextRow = dragHelper = null;
+
 		window.removeEventListener("mousemove", updateSorting);
 		window.removeEventListener("touchmove", updateSorting);
 
@@ -822,7 +828,6 @@ function functionChange() {
 
 	// Undefined with the set data type.
 	if (!input) {
-		helpClose();
 		return;
 	}
 
@@ -852,8 +857,6 @@ function functionChange() {
 	}
 
 	oninput({target: input});
-
-	helpClose();
 }
 
 /**
diff --git a/editor/static/editing.js b/editor/static/editing.js
index 09ba40a8..497d5dbb 100644
--- a/editor/static/editing.js
+++ b/editor/static/editing.js
@@ -6,13 +6,14 @@ function messagesPrint() {
 function selectFieldChange() {
 }
 
-var helpOpen;
+// Help.
+(function() {
+	window.initHelpPopup = function () {
+	};
 
-function helpMouseover() {
-}
-
-function helpMouseout() {
-}
+	window.initHelpFor = function(element, content, side = false) {
+	};
+})();
 
 /** Display typeahead
 * @param string