source http://stackoverflow.com/a/15816867 use em dash “—”. It has no visible spaces between each character.
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<select name="pipiscrew_test_no_css_needed">
<option val="a">A
<option disabled="">————————
<option val="b">B
</select>
test:
origin - http://www.pipiscrew.com/?p=3298 html-separator-into-select