You can use html in <button></button>
With <input type="button"> you can only use string as value value="string".
You can use spans inside <button>.
But according to W3C divs inside a button is incorrect in HTML5
<button>
<span style="color: red">Hello</span>
<span style="color: black">World</span>
</button>
Input tags are "meant" to be used inside a form and <button> outside on random click events.
And of course <input type="button"> has all <input> tags attributes.
When you wanna make a button to within form then you have code <input type ="button"> (Here button is a value) as well as if you wanna just a make button you can use <button></button> Tag.
for one the <button></button> is for basically jumping around in a website whereas <input type="button"> is a radio button better for forms and widgets.
