Chrome Version: 67.0.3396.62 (Official Build) (64-bit)
URL : N/A

There seem to be subtle changes in the way that M67 applies CSS between different ShadowDoms and how it relates to getting text values.

We are using Polymer and have something similar to:

<sidebar>
  <style>
    paper-tabs {
      --paper-tabs: {
        text-transform: uppercase;
      };
    }
  </style>
  <paper-tabs>
    <paper-tab id="myTab">Some text</paper-tab>
  </paper-tabs>
</sidebar>

Getting the innerText on #myTab used to give us "SOME TEXT" but using M67, fetching the innerText using JS we get "Some text".

Both old and new versions correctly display the capitalized "SOME TEXT" in the paper-tab.