Responsive CSS3 Multi-Level, Drop-Down Menu (no JavaScript)

This version has been replaced by a version with better support for tap-activated sub-menus on touchscreen.

This responsive menu is a step on from the CSS3 Multi-Level, Off-Canvas Mobile Menu (no JavaScript) and provides both a mobile and desktop view of the menu.

Desktop (> 960px): You'll see a familiar-looking horizontal, drop-down menu bar at the top of the screen...

Mobile (< 960px): Give that    icon in the top-right corner a click to open the "off-canvas" menu...

Features

A CSS-only, responsive menu that;

* Although an infinite number of nested sub-menus is possible, you'll probably want to stop at 2 or 3 deep due to sub-menus progressively flying right in desktop view (see the "Fly-Left" section below for workaround), and the use of checkboxes as triggers in the "off-canvas" mobile view. The checkbox method requires each sub-menu to be closed in turn, meaning visitors need to keep clicking the large "back"   arrows until the final  ×  comes back in to view. Not the most user-friendly idea, so for that reason, I've provided a responsive menu enhanced with JavaScript where the menu/sub-menus can all be closed in one go (the JavaScript function unchecks all checkboxes).

Please view the source of this web page to grab the CSS and HTML markup.

Fly-Left (desktop view)

OK, so sometimes you'll need a fly-out sub-menu from a button that's already close to the right-hand edge of the screen. No problem; a "fly-left" option is provided to reverse the direction of the fly-outs. The "JemCon.org > Previous JemCons" menu is an example of this.

To trigger the "fly-left" menu, just put a class of "fly-left" on the parent <li> tag;

<li class="fly-left"><a href="#">Previous JemCons</a> <label for="jemcon-previous" class="toggle-sub" onclick="">&#9658;</label>
<input type="checkbox" id="jemcon-previous" class="sub-nav-check"/>    
 <ul id="jemcon-previous-sub" class="sub-nav">
    <li class="sub-heading">Previous JemCons <label for="jemcon-previous" class="toggle" onclick="" title="Back">&#9658;</label></li>
    <li><a href="#">JemCon 2013</a></li>
    <li><a href="#">JemCon 2012</a></li>
...

You can actually reverse the fly-out direction half-way through a series of nested sub-menus too, however, please be aware that on iPad (where the desktop menu is also likely to be visible), this can lead to the reversed fly-out sub-menus obscuring parent menu buttons. On a desktop PC this isn't a problem because the menus hide again once you hover away, but on touch-devices, hovers are replaced with clicks/taps so you cannot hover away to hide the menu. The only way to close an opened menu is to click/tap on another link (see the iOS 'Sticky Hover' fix).

Go-Up (desktop view)

Long, nested drop-down menus will eventually fall off the bottom of the screen. To counter this, a "go-up" option is available to change the vertical direction of drop-downs. In otherwords, to make them go upwards. The "Focus on Function > Services" menu is an example of this.

To trigger the "go-up" menu, just put a class of "go-up" on the parent <li> tag;

<li class="go-up"><a href="#">Services</a> <label for="fof-services" class="toggle-sub" onclick="">&#9658;</label>
<input type="checkbox" id="fof-services" class="sub-nav-check"/>    
 <ul id="fof-services-sub" class="sub-nav">
    <li class="sub-heading">Services <label for="fof-services" class="toggle" onclick="" title="Back">&#9658;</label></li>
    <li><a href="#">Content Management</a></li>
    <li><a href="#">Graphic Design</a></li>
...

CSS Transforms and the "position:fixed" bug in Safari

When CSS Transforms are used (as this menu does), there is a known buggy behaviour in Safari that affects child "position:fixed" elements. What happens is that it seemingly forces them to adopt a "position:absolute" placement, while forcing their immediate parents to "position:relative". This causes some very strange (and frustrating) results. There is an easy fix here though - apply this CSS if you have any "position:fixed" elements inside ".container";

/* #### - corrects 'unfixing' bug in Safari - #### */
@media screen and (-webkit-min-device-pixel-ratio:0) { .container { -webkit-transform:none !important } }

Compatibility

* IE8 and under does not appear on any mobile device so the fact that the "off-canvas" mobile menu doesn't work there isn't really a problem. IE8 doesn't support media queries either so you can just serve an IE8 desktop stylesheet (with the desktop menu CSS) to those visitors.

I haven't been able to test in other browsers/devices but feedback is always welcome. Contact me if you spot anything hinky.

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