Basic portable Web browser; only needs a Go compiler to compile. Optimized for use on 9front and 9legacy, supports plan9port and 9pi as well.

The UI is built with

Still experimental and a lot of features are missing.

Supported features:

  • rudimentary HTML5 and CSS support, large parts like float/flex layout are just stub implementations
  • Server-side rendered websites
  • Images (pre-loaded all at once though)
  • TLS
  • experimental JS/DOM can be activated (very basic jQuery examples work)
  • file downloads

Plan 9


Binaries for amd64 and 386 can be downloaded from

Compile from Source

Set $GOPROXY to and then:

Command line options:

-h                   help
-v                   verbose
-vv                  print debug messages
-jsinsecure          activate js
-cpuprofile filename create cpuprofile

(-v and -vv produce a lot of output,
consider turning on scroll since processing
waits for that…)

$font is used to select the font. Very large fonts will set dpi to 200.



  • Go
  • Plan9Port

It’s more like a demo and it’s not really clear right now how much sandboxing
is really needed. A rudimentary AJAX implementation is there though.

Use on your own Risk!

JS implementation forked from goja (and thus otto). Since the implementation
is very limited anyway, DOM changes are only computed initially and during
click events. A handful of jQuery UI widgets work though, e.g. jQuery UI Tab
view There is also
highly experimental ES6 support with Babel. (

Install the js engine:

cd ..
cd sparklefs
go install ./cmd/sparklefs

On 9legacy also the folders /mnt/opossum and /mnt/sparkle need to exist.

Then it can be tested with:

opossum -jsinsecure
  • load images on the fly
  • implement more parts of HTML5 and CSS
  • create a widget for div/span
  • clean up code, support webfs, snarf

Read More

By |2023-02-20T16:19:25+00:00February 20th, 2023|Education|0 Comments

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