data-level fix, remove XPath #72
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Replaced XPath with
evaluate()inpreprocess()with DOM methods. The code calculates the data-level attribute based onancestor::*[head].This wasn't working properly, at least with JSDOM; it always returned 0. I am getting more reasonable results with DOM methods.
The main motivation for doing this, however, is to allow compatibility with other DOM implemntations/emulators besides JSDOM, such as linkedom and happy-dom.
Also updated dependencies (had to switch out the terser plugin and babel-preset-env)