vulcanize.js

while(htmlImportRemaining()) {
  // Get the first inlinable HTML import
  let nextImport = getNextImport();
  // Resolve the paths relative to the current document URL
  let resolvedImport = resolvePaths(
    thisDocument,
    nextImport.href,
    nextImport.document
  )
  // Replace <link rel="import"> with the document's DOM
  dom5.replace(nextImport, resolvedImport)
}