Set html structure to ul/li. Set roles.

The snippets are a `menubar` in terms of role, and is a list of items (`menitem`, `li`).

Note for myself:  submenus are `menu` roles that immediately follow their triggering `menuitem` and are direct children of the parent `menu`, per WCAG.  This is done in this commit.

client/components/dropdown/dropdown.jsx

@@ -92,7 +92,7 @@ const Dropdown = ({ groupName, className = null, icon, children, color = null, c
 	};
 
 	return (
-		<div className={['menu-wrapper', className].join(' ')} role='none' >
+		<li className='menu-wrapper' role='none'>
 			<button
 				id={`${menuId}-trigger`}
 				className={['menu-item', color].join(' ')}
@@ -105,7 +105,7 @@ const Dropdown = ({ groupName, className = null, icon, children, color = null, c
 				{trigger(groupName, icon)}
 			</button>
 			<MenuDepthContext.Provider value={depth + 1}>
-				<div
+				<ul
 					ref={menuRef}
 					id={menuId}
 					className='menu-list'
@@ -114,9 +114,9 @@ const Dropdown = ({ groupName, className = null, icon, children, color = null, c
 					onClick={handleMenuActionClick}
 				>
 					{children}
-				</div>
+				</ul>
 			</MenuDepthContext.Provider>
-		</div>
+		</li>
 	);
 };
 

client/homebrew/editor/snippetbar/snippetbar.jsx

@@ -188,7 +188,7 @@ const Snippetbar = createReactClass({
 		const snippets = this.state.snippets.filter((snippetGroup)=>snippetGroup.view === this.props.view);
 		if(snippets.length === 0) return null;
 
-		return <div className='snippets'>
+		return <ul className='snippets' role='menubar'>
 			{_.map(snippets, (snippetGroup)=>{
 				return <SnippetGroup
 					brew={this.props.brew}
@@ -201,7 +201,7 @@ const Snippetbar = createReactClass({
 				/>;
 			})
 			}
-		</div>;
+		</ul>;
 	},
 
 	replaceContent : function(item){
@@ -327,12 +327,14 @@ const SnippetGroup = createReactClass({
 		return _.map(snippets, (snippet)=>{
 			if(!snippet.subsnippets){
 				return (
-					<button className='menu-item' key={snippet.name} onClick={(e)=>this.handleSnippetClick(e, snippet)} role='menuitem'>
-						<i className={snippet.icon} />
-						<span className={`name${snippet.disabled ? ' disabled' : ''}`} title={snippet.name}>{snippet.name}</span>
-						{snippet.experimental && <span className='beta'>beta</span>}
-						{snippet.disabled     && <span className='beta' title='temporarily disabled due to large slowdown; under re-design'>disabled</span>}
-					</button>
+					<li key={snippet.name} role='none'>
+						<button className='menu-item'  onClick={(e)=>this.handleSnippetClick(e, snippet)} role='menuitem'>
+							<i className={snippet.icon} />
+							<span className={`name${snippet.disabled ? ' disabled' : ''}`} title={snippet.name}>{snippet.name}</span>
+							{snippet.experimental && <span className='beta'>beta</span>}
+							{snippet.disabled     && <span className='beta' title='temporarily disabled due to large slowdown; under re-design'>disabled</span>}
+						</button>
+					</li>
 				);
 			} else if(snippet.subsnippets){
 				return (