WIP
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<button type="menu">

While in the HTML 5.1 spec, it is removed in the HTML living standard. Dropped because lack of support by browsers.
It was only used opening menus. At this moment there isn’t a spec. for adding menu items to the context menu.

Advised markup

Emmet

button[type="button"]

Toggle button

button[type="button"][aria-pressed]

button[type="button"][aria-haspopup][aria-expanded]

HTML

<button type="button"></button>

Toggle button

<button type="button" aria-pressed="false"></button>

<!-- when closed -->
<button type="button" aria-haspopup="true"></button>

<!-- when opened -->
<button type="button" aria-haspopup="true" aria-expanded="true"></button>

Screen reader results

<button>

<button>Test</button>

<input type="button">

<input type="button" value="Test">

Toggle button

<button type='button' aria-pressed='false'>Test</button>
Screen reader voiceover (macOs) 7.0 (477.40.6) ChromeVox 53 NVDA 2017.4 Narrator 10.0.16299.15
Browser Chrome 62 Safari 10 Firefox 55 Chrome 62 Firefox 57 Chrome 63 Edge 16 IE 11 Edge 16 IE 11
Spoken output Test, toggle buttonTest, toggle buttonTest, buttonTest, button not pressedtoggle button not pressed, Testtoggle button not pressed, Testtoggle button not pressed, Testbutton, Testoff, Test, buttonoff, Test, button
Skipped falsefalsefalsefalsefalsefalsefalsefalsefalsefalse

Pressed Toggle Button

<button type='button' aria-pressed='true'>Test</button>
Screen reader voiceover (macOs) browsers ChromeVox 53 NVDA 2017.4
Browser Chrome 62 Safari 10 Firefox 55 Chrome 62 Firefox 57 Chrome 63 Edge 16 IE 11
Spoken output Test, selected, toggle buttonTest, toggle buttonTest, buttonTest, button pressedtoggle button pressed, Testtoggle button pressed, Testtoggle button pressed, Testbutton pressed, Test
Skipped falsefalsefalsefalsefalsefalsefalsefalse

Menu Button

<button type="button" aria-haspopup="true">Test</button>
Screen reader voiceover (macOs) 7.0 (477.40.6) ChromeVox 53 NVDA 2017.4
Browser Chrome 62 Safari 10 Firefox 55 Chrome 62 Firefox 57 Chrome 63 Edge 16 IE 11
Spoken output Test, pop up buttonTest, pop up buttonTest, menu buttonTest, pop up buttonmenu button subMenu, Testmenu button subMenu, Testbutton, Testbutton subMenu, Test
Skipped falsefalsefalsefalsefalsefalsefalsefalse

Menu button with open menu

<button type="button" aria-haspopup="true" aria-expanded="true">Test</button>
Screen reader voiceover (macOs) 7.0 (477.40.6) ChromeVox 53 NVDA 2017.4
Browser Chrome 62 Safari 10 Firefox 55 Chrome 62 Firefox 57 Chrome 63 Edge 16 IE 11
Spoken output Test, expanded, pop up buttonTest, expanded, pop up buttonTest, menu buttonTest, popup button expandedmenu button expanded subMenu, Testmenu button expanded subMenu, Testbutton expanded, Testbutton expanded subMenu, Test
Skipped falsefalsefalsefalsefalsefalsefalsefalse 
<button type="button" aria-haspopup="true" aria-expanded="true" aria-controls="menu-1">Test</button>
<ul id="menu-1" role="menu">
  <li role="menuitem">Menu item</li>
</ul>
Screen reader voiceover (macOs) 7.0 (477.40.6) ChromeVox 53 NVDA 2017.4
Browser Chrome 62 Safari 10 Firefox 55 Chrome 62 Firefox 57 Chrome 63 Edge 16 IE 11
Spoken output Test, expanded, pop up buttonTest, expanded, pop up buttonTest, menu buttonTest, popup button expandedmenu button expanded subMenu, Testmenu button expanded subMenu, Testbutton expanded, Testbutton expanded subMenu, Test
Skipped falsefalsefalsefalsefalsefalsefalsefalse

Specifications