HTML: trailing '/' as attribute value and Attribute Separator as dsOperator
<input value=abc/>
<!-- ~~~~ Value (previously '/' was Element Symbols)
~ Element Symbols
-->
<input checked type = "checkbox"/>
<!-- ~~~~~~~~~~~~~~ Attribute
~ previously Other Text for spaces on the right
-->
<input value=abc="b/>
<!-- ~~~ ~ Value
~~ Error
Previoulsy: (abc="b)
~~~~ Value
~~ Error
The standard specifies that ", ', <, = and ` are a parsing error, but added in the attribute value
-->