Does not handle elements detached from DOM

[jklmli]

If an element has already been detached from the DOM, this throws an exception in testUniqueness, which assumes that parentNode always exists.

[jasan-s]

having the same issue here. @jiaweihli did you solve this? im using it in react and i am using some ternary expression to render components and it throws that error when certain elements are removed from dom.

[jasan-s]

@jiaweihli its def been a while but this PR resolves the issue #39

[tathastu871]

const elements = parentNode?.querySelectorAll( CSS.escape(selector) )
return elements?.length === 1 && elements[ 0 ] === element;
}

Use ?.Will Work as if parentNode not available

also instead of selector use CSS.escape(selector)

It will automatiackly escapes spevial chrcaters like . whitespace % t etc etc from id and class

No need of if statememy