Web Accesibility Tool

http://wave.webaim.org/ Does anyone have experience with this free tool?
I have three "RED" errors that need to be repaired they show up as EMPTY BUTTON next to the (3) mentions of button below in the code. I need to repair this

</div></div><div id="cboxOverlay" style="display: none;">
11<div id="colorbox" class="" role="dialog" tabindex="-1" style="display: none;"><div id="cboxWrapper"><div><div id="cboxTopLeft" style="float: left;"><div id="cboxTopCenter" style="float: left;"><div id="cboxTopRight" style="float: left;"></div><div style="clear: left;"><div id="cboxMiddleLeft" style="float: left;"><div id="cboxContent" style="float: left;"><div id="cboxTitle" style="float: left;"><div id="cboxCurrent" style="float: left;">
1<button type="button" id="cboxPrevious">
1<button type="button" id="cboxNext">
1<button id="cboxSlideshow">
<div id="cboxLoadingOverlay" style="float: left;"><div id="cboxLoadingGraphic" style="float: left;"></div><div id="cboxMiddleRight" style="float: left;"></div><div style="clear: left;"><div id="cboxBottomLeft" style="float: left;"><div id="cboxBottomCenter" style="float: left;"><div id="cboxBottomRight" style="float: left;"></div></div><div style="position: absolute; width: 9999px; visibility: hidden; display: none; max-width: none;"></div>
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Chris StanyonWebDevCommented:
The correct HTML for a button is:

<button type="button" id="cboxPrevious">Some Content</button>

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Julian HansenCommented:
What is your expectation with this code
1<button type="button" id="cboxPrevious">
1<button type="button" id="cboxNext">
1<button id="cboxSlideshow">

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As Chris pointed out in his post a button needs a closing tag and some text what you have done is opened a button then inside that button opened a second and then inside that a third and inside that a bunch of html

What are the '1's for in the code above?
medic944Author Commented:
Awesome, worked like a charm. Thanks
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