Test DOM XPath behaviour with root element adjacent nodes · web-platform-tests/wpt#10072

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domxpathgood first issuetype:missing-coverage

Description

See https://github.com/w3c/web-platform-tests/pull/10055#issuecomment-373666278

we need tests for root adjacent comments, [processing instructions], and doctypes (esp. doctypes, given XPath has no notion of them)

See domxpath/document.tentative.html for a similar test. The DOCTYPE and comment are easily enough tested in HTML; the PI case is probably easiest to do by adding it through the DOM.

Contributor guide

Tech stack: htmljavascript
Domain: testingfrontend
Issue type: test
Difficulty: 3
Estimated time: half day
Activity status: stale
Clarity: mostly clear
Prerequisites: Basic knowledge of XPathFamiliarity with HTML and DOM
Newbie friendliness: 60
Research direction: The issue references a comment on PR #10055 requesting tests for root adjacent comments, processing instructions, and doctypes for XPath. The existing test file 'domxpath/document.tentative.html' provides a pattern. For DOCTYPE and comment cases, they can be tested directly in HTML documents. For the processing instruction case, it may need to be added via DOM manipulation in JavaScript. A contributor should examine that file and the linked PR to understand expected behavior and then write tests for each case.