Standards for developing consistent, flexible, and sustainable HTML and CSS.
SCSS
8,468 ★
1,106 forks
9 issues
yesterday
Profile tree
Data from GitHub API- Contributions: 1,251. Past 12 months.
- Followers: 23,849. People who follow you.
- Total stars: 21,162. 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.
- 1,251 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
1,251
Contributions
Past 12 months
0
Current streak
No active streak
16
Longest streak
Jun 17, 2026 – Jul 2, 2026
Less
More
- HTML 86.4%
- CSS 11.1%
- JavaScript 1.8%
- Shell 0.4%
- SCSS 0.2%
- Ruby 0.1%
- 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
227 contributions
Most active year
2021
1,232 contributions
Signature language
HTML
86% of tracked code
Flagship repository
code-guide
8,468 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 21,162 stars, led by code-guide at 8,468. Their activity over the last twelve months totals 1,251 contributions, including a longest run of 16 consecutive active days. Mark Otto has been on GitHub since 2009 and is followed by 23,849 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.
Showcase the success of any GitHub repo or user with these simple, static buttons with dynamic counts.
- github
JavaScript
2,895 ★
263 forks
12 issues
3d ago
A collection of LESS mixins and variables for writing better CSS.
CSS
1,664 ★
163 forks
2 issues
10d ago
Common reasons your HTML and CSS may be fucked.
CSS
1,447 ★
80 forks
15 issues
22d ago
wtf-forms
Archived
Friendlier HTML form controls with a little CSS magic.
CSS
2,672 ★
152 forks
23d ago
Personal checklist for setting up a new Mac's dev environment.
- checklist
- config
- shell
Shell
632 ★
87 forks
1 issues
4d ago
Library of commonly used snippets for Jekyll sites.
540 ★
21 forks
1 issues
3mo ago
MIT
GitHub
Userstyle for making all of GitHub completely fluid.
CSS
500 ★
79 forks
3 issues
11d ago
MIT
GitHub
Simple CSS grid system using `display: table;`.
CSS
467 ★
44 forks
1mo ago
The most popular HTML, CSS, and JavaScript framework for developing responsive, mobile first projects on the web.
MDX
174,568 ★
78,679 forks
Official open source SVG icon library for Bootstrap.
TypeScript
8,087 ★
1,123 forks
Standards for developing consistent, flexible, and sustainable HTML and CSS.
SCSS
8,468 ★
1,106 forks
Showcase the success of any GitHub repo or user with these simple, static buttons with dynamic counts.
JavaScript
2,895 ★
263 forks
Personal checklist for setting up a new Mac's dev environment.
Shell
632 ★
87 forks
Friendlier HTML form controls with a little CSS magic.
CSS
2,672 ★
152 forks
-
code-guide 8,468 ★
Standards for developing consistent, flexible, and sustainable HTML and CSS.
-
github-buttons 2,895 ★
Showcase the success of any GitHub repo or user with these simple, static buttons with dynamic counts.
-
wtf-forms 2,672 ★
Friendlier HTML form controls with a little CSS magic.
-
preboot 1,664 ★
A collection of LESS mixins and variables for writing better CSS.
-
wtf-html-css 1,447 ★
Common reasons your HTML and CSS may be fucked.
-
config 632 ★
Personal checklist for setting up a new Mac's dev environment.
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%
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22
Public repos
Owned, non-fork
21K
Total stars
Across all repos
1,251
Contributions
Past 12 months
481
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 |
|---|
No repositories match those filters.
Coding statistics
→
Contribution patterns
→
By year
-
2026
683
-
2025
708
-
2024
128
-
2023
519
-
2022
1,158
-
2021
1,232
By day of week
-
Sun
43
-
Mon
180
-
Tue
227
-
Wed
206
-
Thu
215
-
Fri
169
-
Sat
42
Best coding day: Tue
By month (last 12)
-
Sep
44
-
Oct
128
-
Nov
62
-
Dec
99
-
Jan
72
-
Feb
37
-
Mar
126
-
Apr
132
-
May
100
-
Jun
102
-
Jul
86
-
Aug
28
GitHub journey
→
-
June 2009
Joined GitHub
Created the @mdo account.
-
January 2011
Created first repository
Published mdo-df-css, the oldest repository still on the account.
-
January 2011
First starred repository
mdo-df-css is the earliest-created repository to have earned stars.
-
February 2014
Reached 10 repositories
css-perf was the 10th public repository created.
-
June 2021
Most productive year: 2021
1,232 contributions recorded in 2021, more than any other year on record.
-
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
2012
Went deeper into CSS.
CSS
SCSS
- Repos this year
- 3
- Total repos
- 7
- Stars, as of today
- 13k
2014
Went deeper into CSS.
CSS
HTML
Shell
- Repos this year
- 9
- Total repos
- 16
- Stars, as of today
- 20k
2015
Went deeper into CSS.
CSS
- Repos this year
- 3
- Total repos
- 19
- Stars, as of today
- 21k
2016
Shifted from CSS to Shell.
Shell
- Repos this year
- 1
- Total repos
- 20
- Stars, as of today
- 21k
2017
Shifted from Shell to CSS.
CSS
- Repos this year
- 1
- Total repos
- 21
- Stars, as of today
- 21k
2021
Shifted from CSS to Shell.
Shell
- Repos this year
- 1
- Total repos
- 22
- Stars, as of today
- 21k
- Contributions
- 1,232
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
21,162
Stars received
185
Repositories starred
2,180
Forks received
16
Issues opened
Past 12 months
481
Pull requests opened
Past 12 months
77
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.
Created that year
Cumulative total
Language tree
Built automatically from repository languages and topics.
Programming Languages →
- HTML
- CSS
- JavaScript
- Shell
- SCSS
- Ruby