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Mark Otto on GitHub

Mark Otto

@mdo

Designer, developer, and advisor. Building Pierre. Creator of Bootstrap (@twbs). Previously @github and @twitter. Huge nerd.

  • @pierredotco
  • San Francisco, CA
  • 21K
    Total stars
  • 24K
    Followers
  • 22
    Public repos
  • 1,312
    Contributions

1 following

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Profile tree

  • Contributions: 1,312. Past 12 months.
  • Followers: 23,874. People who follow you.
  • Total stars: 21,143. Across all repos.
  • Following: 1. People you follow.
  • Public repos: 22. Owned, non-fork.

A living snapshot

Every leaf is a headline number from Mark Otto’s public GitHub. The canopy fills out as the work grows - sway and all.

  • 1,312 Contributions Past 12 months
  • 24K Followers People who follow you
  • 21K Total stars Across all repos
  • 1 Following People you follow
  • 22 Public repos Owned, non-fork

Data from GitHub API · refreshed in real time

What your GitHub says

Based on public GitHub activity · how this is calculated

  • HTML is the largest language share across analyzed repositories, at 86%.

    High confidence

  • Public GitHub activity is collaboration-heavy: pull requests account for 54% of tracked contribution activity.

    Medium confidence

  • Most analyzed repositories (18 of 22) show no public activity in over a year.

    Medium confidence

Profile health

Signals from analyzed public data

Activity 85

Strong

  • 1,312 contributions in the trailing year
  • 4-day current streak
Portfolio 33

Needs work

  • 1 of 22 analyzed repositories are actively maintained
  • 21,143 stars across analyzed repositories
Discoverability 60

Developing

  • 1 of 22 analyzed repositories have no description
  • 19 of 22 have no topic tags
Maintenance 5

Needs work

  • 1 of 22 analyzed repositories were pushed to in the last 6 months
  • 18 show no public activity in over a year
Collaboration 99

Strong

  • 503 pull requests and 75 code reviews in the trailing year
  • 185 repositories starred

Recruiter snapshot

A skim of public evidence, not a hiring judgement

Technical focus
HTML / CSS / JavaScript / Shell

Largest language shares across analyzed repositories

Project depth
1 of 22

Analyzed repositories rated established or maintained

Collaboration
503 PRs / 75 reviews

Public pull requests and code reviews in the trailing year

Community signals
21,143 stars / 2,174 forks

Summed across analyzed repositories

Recent activity
12 of last 12 months

Calendar months with at least one tracked contribution

Strongest signals

  • 503 pull requests and 75 code reviews in the trailing year
  • 1,312 contributions in the trailing year
  • 1 of 22 analyzed repositories have no description

1,312
Contributions
Past 12 months
4
Current streak
Sep 20, 2026 – Sep 23, 2026
16
Longest streak
Jun 17, 2026 – Jul 2, 2026
Sep Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Mon Wed Fri
Less More

Language distribution for mdo HTML 86.4%, CSS 11.1%, JavaScript 1.8%, Shell 0.4%, SCSS 0.2%, Ruby 0.1%
  • HTML 86.4%
  • CSS 11.1%
  • JavaScript 1.8%
  • Shell 0.4%
  • SCSS 0.2%
  • Ruby 0.1%

Frontend Backend Mobile DevOps Data AI Security Embedded Game Dev
  • Frontend 100
  • DevOps 25
  • Backend 0
  • Mobile 0
  • Data 0
  • AI 0
  • Security 0
  • Embedded 0
  • Game Dev 0

Longest streak
16d
Jun 2026
Favourite coding day
Tuesday
239 contributions
Most active year
2021
1,232 contributions
Signature language
HTML
86% of tracked code
Flagship repository
code-guide
8,464 stars
On GitHub since
2009
17 years and counting

Across their public repositories, Mark Otto works mainly in HTML, which accounts for roughly 86% of their committed code, alongside CSS and JavaScript. They have 22 public repositories, which together have earned 21,143 stars, led by code-guide at 8,464. Their activity over the last twelve months totals 1,312 contributions, including a longest run of 16 consecutive active days. Mark Otto has been on GitHub since 2009 and is followed by 23,874 developers.

This overview is generated from Mark Otto’s public GitHub activity at the time of the last refresh. Figures cover public repositories and the trailing twelve months of contributions.

  1. 01

    Review code-guide

    High impact

    code-guide is pinned to your profile but hasn't been pushed to in over a year.

    code-guide →
  2. 02

    Add topics to code-guide

    High impact

    code-guide is pinned but has no topic tags, making its stack harder to identify.

    code-guide →
  3. 03

    Review config

    High impact

    config is pinned to your profile but hasn't been pushed to in over a year.

    config →
  4. 04

    Reconsider pinning wtf-forms

    High impact

    wtf-forms is pinned to your profile but is archived.

    wtf-forms →
  5. 05

    Add a license to config

    Medium impact

    config is pinned and public but has no detected license.

    config →
  6. 06

    Add topics to preboot

    Low impact

    preboot has no topic tags, making its technology harder to discover.

    preboot →
  7. 07

    Add topics to wtf-html-css

    Low impact

    wtf-html-css has no topic tags, making its technology harder to discover.

    wtf-html-css →

How these are calculated: see the methodology page .

github-buttons

Showcase the success of any GitHub repo or user with these simple, static buttons with dynamic counts.

  • github
JavaScript 2,897 ★ 263 forks 12 issues 10d ago
Apache-2.0 Live demo GitHub
preboot

A collection of LESS mixins and variables for writing better CSS.

CSS 1,661 ★ 161 forks 2 issues 12d ago
NOASSERTION Live demo GitHub
config

Personal checklist for setting up a new Mac's dev environment.

  • checklist
  • config
  • shell
Shell 633 ★ 87 forks 1 issues yesterday
GitHub
github-wide

Userstyle for making all of GitHub completely fluid.

CSS 500 ★ 79 forks 3 issues 23d ago
MIT GitHub

Most popular
code-guide

8,464 stars

Most recently active
github-buttons

Last pushed 3mo ago

Longest maintained
github-buttons

Active for 14.9y

Most discoverable
github-buttons

100% of discoverability signals present

bootstrap

The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.

MDX 174,894 ★ 78,578 forks
icons

Official open source SVG icon library for Bootstrap.

TypeScript 8,133 ★ 1,122 forks
code-guide

Standards for developing consistent, flexible, and sustainable HTML and CSS.

SCSS 8,464 ★ 1,104 forks
github-buttons

Showcase the success of any GitHub repo or user with these simple, static buttons with dynamic counts.

JavaScript 2,897 ★ 263 forks
config

Personal checklist for setting up a new Mac's dev environment.

Shell 633 ★ 87 forks
wtf-forms

Friendlier HTML form controls with a little CSS magic.

CSS 2,669 ★ 151 forks

  • code-guide 8,464 ★

    Standards for developing consistent, flexible, and sustainable HTML and CSS.

  • github-buttons 2,897 ★

    Showcase the success of any GitHub repo or user with these simple, static buttons with dynamic counts.

  • wtf-forms 2,669 ★

    Friendlier HTML form controls with a little CSS magic.

  • preboot 1,661 ★

    A collection of LESS mixins and variables for writing better CSS.

  • wtf-html-css 1,440 ★

    Common reasons your HTML and CSS may be fucked.

  • config 633 ★

    Personal checklist for setting up a new Mac's dev environment.

All repositories →

Public visibility is moderately spread across several repositories rather than one or two.

Top 1 repository 40% of stars
Top 3 repositories 66% of stars
Top 5 repositories 81% of stars

Leading repository: code-guide (8,464 stars, 21,143 total across analyzed repositories)

Technology breakdown

Derived from repository languages and topics - horizontal bars, never a pie.

Languages

  • HTML 86%
  • CSS 11%
  • JavaScript 2%
  • Shell 0%
  • SCSS 0%
  • Ruby 0%

README, contributing-guide and GitHub Actions badges below are detected by exact filename on each repository’s default branch - they report presence, not quality.

  • github-buttons Established
    Popularity 33
    Discoverability 100
    Maintenance 85
    README No contributing guide CI: 2 workflows
  • code-guide Dormant
    Popularity 100
    Discoverability 75
    Maintenance 0
    README No contributing guide No CI workflow
  • wtf-forms Archived
    Popularity 30
    Discoverability 75
    Maintenance 0
    README No contributing guide No CI workflow
  • preboot Dormant
    Popularity 19
    Discoverability 75
    Maintenance 0
    README No contributing guide No CI workflow
  • wtf-html-css Dormant
    Popularity 16
    Discoverability 75
    Maintenance 0
    README No contributing guide No CI workflow
  • css-perf Archived
    Popularity 6
    Discoverability 75
    Maintenance 0
    README No contributing guide No CI workflow
  • table-grid Dormant
    Popularity 5
    Discoverability 75
    Maintenance 0
    README No contributing guide No CI workflow
  • mdoml Dormant
    Popularity 2
    Discoverability 75
    Maintenance 0
    README No contributing guide No CI workflow
  • jekyll-example Dormant
    Popularity 2
    Discoverability 75
    Maintenance 0
    README No contributing guide No CI workflow
  • css-output Dormant
    Popularity 1
    Discoverability 75
    Maintenance 0
    README No contributing guide No CI workflow
  • bootstrap-css-grid-layout Dormant
    Popularity 1
    Discoverability 75
    Maintenance 0
    No README No contributing guide No CI workflow
  • config Dormant
    Popularity 8
    Discoverability 50
    Maintenance 0
    README No contributing guide No CI workflow

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Experience
Education

22
Public repos
Owned, non-fork
21K
Total stars
Across all repos
1,312
Contributions
Past 12 months
503
Pull requests
Opened this year
11
Public gists
Snippets shared
17 y
Account age
Since 2009
100 %
Profile score
Completeness

Repository explorer

→

Name Language Stars Forks Size Updated

Coding statistics

→
Largest repository
12.8 MB
minecraft
Smallest repository
2 KB
config
Oldest repository
Jan 11, 2011
mdo-df-css
Newest repository
Jul 27, 2021
dotfiles
Most starred
8,464 ★
code-guide
Most forked
1,104 forks
code-guide
Most watched
282 watchers
code-guide
Longest description
221 characters
bsu
Most open issues
15 open
wtf-html-css

Contribution patterns

→

By year

  • 2026
    822
  • 2025
    708
  • 2024
    128
  • 2023
    519
  • 2022
    1,158
  • 2021
    1,232

By day of week

  • Sun
    53
  • Mon
    174
  • Tue
    239
  • Wed
    223
  • Thu
    215
  • Fri
    184
  • Sat
    41

Best coding day: Tue

By month (last 12)

  • Oct
    128
  • Nov
    62
  • Dec
    99
  • Jan
    72
  • Feb
    37
  • Mar
    126
  • Apr
    132
  • May
    100
  • Jun
    102
  • Jul
    86
  • Aug
    103
  • Sep
    64

GitHub journey

→
  1. June 2009

    Joined GitHub

    Created the @mdo account.

  2. January 2011

    Created first repository

    Published mdo-df-css, the oldest repository still on the account.

  3. January 2011

    First starred repository

    mdo-df-css is the earliest-created repository to have earned stars.

  4. February 2014

    Reached 10 repositories

    css-perf was the 10th public repository created.

  5. June 2021

    Most productive year: 2021

    1,232 contributions recorded in 2021, more than any other year on record.

  6. July 2021

    Latest repository

    dotfiles is the most recently created repository.

Developer evolution

Your GitHub career, year by year.

 →
2011

Started with CSS.

CSS JavaScript
Repos this year
4
Total repos
4
Stars, as of today
4.8k
github-buttons
2012

Went deeper into CSS.

CSS SCSS
Repos this year
3
Total repos
7
Stars, as of today
13k
code-guide
2014

Went deeper into CSS.

CSS HTML Shell
Repos this year
9
Total repos
16
Stars, as of today
20k
wtf-forms
2015

Went deeper into CSS.

CSS
Repos this year
3
Total repos
19
Stars, as of today
21k
jekyll-snippets
2016

Shifted from CSS to Shell.

Shell
Repos this year
1
Total repos
20
Stars, as of today
21k
minecraft
2017

Shifted from Shell to CSS.

CSS
Repos this year
1
Total repos
21
Stars, as of today
21k
bootstrap-css-grid-layout
2021

Shifted from CSS to Shell.

Shell
Repos this year
1
Total repos
22
Stars, as of today
21k
Contributions
1,232
dotfiles

Built from mdo’s public, non-fork repositories. Star totals reflect current counts, not historical snapshots.

Achievements

4 / 9 unlocked

Explorer
Created repositories in 8 or more languages
Builder
More than 50 public repositories
Open Source Enthusiast
100+ stars received across all repositories
Consistent
A 100-day-or-longer contribution streak
Documentation Hero
5 or more repositories with a detailed description
Popular
500 or more followers
Prolific Committer
1,000 or more commits in the past 12 months
Long Timer
5 or more years on GitHub
Star Collector
Starred 100 or more repositories

Open source activity

21,143
Stars received
185
Repositories starred
2,174
Forks received
15
Issues opened
Past 12 months
503
Pull requests opened
Past 12 months
75
Reviews given
Past 12 months
11
Public gists

Language evolution

The primary languages of repositories created each year.

2011
  • CSS
  • JavaScript
2012
  • CSS
  • SCSS
2014
  • CSS
  • HTML
  • Shell
2015
  • CSS
2016
  • Shell
2017
  • CSS
2021
  • Shell

Repository growth

Repositories created per year, and the running total.

4 repositories created in 2011 3 repositories created in 2012 9 repositories created in 2014 3 repositories created in 2015 1 repositories created in 2016 1 repositories created in 2017 1 repositories created in 2021 4 total repositories by end of 2011 7 total repositories by end of 2012 16 total repositories by end of 2014 19 total repositories by end of 2015 20 total repositories by end of 2016 21 total repositories by end of 2017 22 total repositories by end of 2021 2011 2012 2014 2015 2016 2017 2021 22 0
Created that year Cumulative total

Language tree

Built automatically from repository languages and topics.

Programming Languages →
  • HTML
  • CSS
  • JavaScript
  • Shell
  • SCSS
  • Ruby