hterm: Ensure the Page Up button isn't shown when the ScrollPort is focussed

Currently when the ScrollPort is focussed (e.g. when pasting data from
the clipboard) it will cause the PageUp button to be shown. This is
because selection is set to the start of the <x-screen> element. Instead
we set selection to the caret position, or if the caret is offscreen to
the last row in the terminal. This also improves things from an
accessibility standpoint.

Bug: 863668
Change-Id: Id87335b63a4e799e3c2ace4012cb6c3b7a97e707
Reviewed-by: Mike Frysinger <>
Tested-by: Raymes Khoury <>
4 files changed
tree: f54d6623b855bb4a0abd2c70d4afe4effcda178e
  1. .clang-format
  2. .eslintrc.js
  3. .gitignore
  4. .pylintrc
  8. hterm/
  9. libdot/
  10. nassh/
  12. package.json
  13. saltpig/
  14. ssh_client/
  15. wam/
  16. wash/


This repository contains the libdot JavaScript library and some web applications that make use of it.

The official copy of this repository is hosted at

There is also a mirror on github at A few subprojects are also extracted out into their own git repo and mirrored. Keep in mind that these mirrors may occasionally be behind the official repository.

All changes must go through the Gerrit code review server on Github pull requests cannot be accepted. Please see the document in this directory for the details.

Top level directories

  • libdot/ is a small set of JS libraries initially developed as part of hterm, now available as shared code.

  • hterm/ is a JS library that provides a terminal emulator. It is reasonably fast, reasonably correct, and reasonably portable across browsers.

  • nassh/ is the Secure Shell Chrome App (currently a “v1.5” app, soon to become a “v2” or platform app) that combines hterm with a NaCl build of OpenSSH to provide a PuTTY-like app for Chrome users.

  • ssh_client/ is the NaCl port of OpenSSH. It is used by nassh to create the Secure Shell App.

  • wash/ is a library for cross-origin virtual filesystems, similar to the Plan 9 filesystem. This directory also contains a simple bash-like shell environment for exploring these filesystems. The code in this directory is a work-in-progress.