Next batch of WPT dom/shadow-dom conformance fixes in bootstrap.js:
- Popover API: popover reflection, showPopover/hidePopover/togglePopover, ToggleEvent, :popover-open
- Legacy event init: initEvent/initUIEvent/initMouseEvent/initKeyboardEvent/initCompositionEvent, CompositionEvent
- Document.createCDATASection / createProcessingInstruction (XML-gated)
- classList as a real DOMTokenList (+ relList/sandbox/sizes/htmlFor), spec-correct namespaceURI
- getElementsByClassName ASCII-whitespace tokenization
- HTMLCollection.namedItem and named access; createRange on document/iframe/DOMParser
- attachShadow mode validation and a real ShadowRoot (cloneNode throws, activeElement, styleSheets)
querySelectorAll returns a NodeList; named access on live HTMLCollections is
resolved lazily via a Proxy so query hot paths stay at native speed.
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