I’m doing a bit of webscraping, patterned after that in the DataDepsGenerators package, using Gumbo and Cascadia.  I don’t quite understand the syntax of the selector expressions in Cascadia and I haven’t been able to find any descriptions, either in Cascadia.jl or in the original package for Go.  I want to select elements of the form
  <div id="articleTitle">
  <h3>
        Multimodal character viewpoint in quoted dialogue sequences
  </h3>
  </div>
  <div id="authorString">
      <em>
          Kashmiri Stec, Mike Huiskes, Martijn Wieling, Gisela Redeker
      </em>
  </div>
I can use something like
julia> first(eachmatch(Selector("""[id="authorString"]"""), art144.root))
HTMLElement{:div}:
<div id="authorString">
  <em>
    Kashmiri Stec, Mike Huiskes, Martijn Wieling, Gisela Redeker
  </em>
</div>
but that is just groping around in the dark if I don’t know the syntax.