It seems to auto-close <button> (and <a>) tags when nested inside another element. I wrote this test that fails:

testNestedButton
������ "this works with nested <div> tags instead of <button> and when there is no enclosing <div> at all. but here <button> is auto-closed."

������ "a does not work either"

������ | soup |
������ soup := Soup
������ ������ fromString:
������ ������ ������ '<div><button>
�������������� <span>text</span>
���� </button>
</div>'.
������ self assert: soup div button span string equals: 'text'

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