User feedback:
https://feedback.corp.google.com/product/282/neutron?lView=rd&lReport=15555610522

I have also experienced this (Headers missing and replaced by "ElectoralVote" as the heading.

The root cause here is the (arguably) improper use of heading tags. All the tags are <h4>, while they should've been <h1>, or at least <h2>. We only recognize <h1> to <h3> as headings right now.

After some software archaeology, boilerpipe also only recognize <h1> to <h3>.
https://github.com/kohlschutter/boilerpipe/blob/2c78035a830282e2435c466f3f14d6d4104d0a94/boilerpipe-common/src/main/java/com/kohlschutter/boilerpipe/sax/DefaultTagActionMap.java#L78

However, the original paper did mention all h1 to h6.
http://www.l3s.de/~kohlschuetter/publications/wsdm187-kohlschuetter.pdf

I guess it's probably OK to add all headings, including h4 to h6.

Thanks for looking into this so quickly! 

Issue 657682 has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a22aa4380f04d2d8aa18f1f3098393516646f181

commit a22aa4380f04d2d8aa18f1f3098393516646f181
Author: wychen <wychen@chromium.org>
Date: Mon Oct 24 19:38:13 2016

Roll DOM Distiller JavaScript distribution package

Diff since last roll:
https://github.com/chromium/dom-distiller/compare/d16a68c1b8...072fe57b48

Picked up changes:
072fe57 Recognize H4 to H6 as headings as well
52047b4 Avoid using getClassName() to avoid issues with <svg>
8cf93ce Bump ChromeDriver version to 2.24
d876125 Add gen_mhtml_corpus.py to convert MHTML to eval corpus
8b33c8b Amend "Fix partially hidden article"
3fd2017 Strip unwanted classNames from all nodes

BUG=593457,599121, 647098 , 658038 

Review-Url: https://codereview.chromium.org/2447453002
Cr-Commit-Position: refs/heads/master@{#427118}

[modify] https://crrev.com/a22aa4380f04d2d8aa18f1f3098393516646f181/DEPS
[modify] https://crrev.com/a22aa4380f04d2d8aa18f1f3098393516646f181/third_party/dom_distiller_js/README.chromium