Tracked site: https://slack.com/.
Checked against the Web 1.0 Specification
(2026 Edition), front page
only, roughly every two weeks.
F
Fails on multiple major faults.
Latest check: 2026-09-29.
4 major, 1 minor;
251 KB first-party transfer,
117 requests.
Rule by rule
| Rule | Fault | Result |
|---|
| JS-01 | JavaScript |
MAJOR
- inline <script>
- <script src="https://a.slack-edge.com/bv1-13-br/manifest.39f4356643961c77.marketing.min.js">
- inline <script>
- inline <script>
- inline <script>
- and 69 more
|
| TP-01 | Third-party requests |
MAJOR
- https://d34u8crftukxnk.cloudfront.net (via <link rel=preconnect>)
- https://a.slack-edge.com/9cc0056/img/icons/favicon-32.png (via <link rel=icon>)
- https://a.slack-edge.com/bv1-13-br/rollup-style-spacesuit-colorswap.f5c7d89c95acefcb.min.css (via <link rel=stylesheet>)
- https://a.slack-edge.com/bv1-13-br/rollup-style-product-uis-custom.a3a86fd4a57c08a0.min.css (via <link rel=stylesheet>)
- https://a.slack-edge.com/bv1-13-br/marketing-style-page-index-2025-colorswap.abcf46b42ecd5507.min.css (via <link rel=stylesheet>)
- and 111 more
|
| CK-01 | Cookies |
MAJOR
- Set-Cookie on https://slack.com/
|
| WT-01 | Excessive transfer |
pass |
| AV-01 | Autoplaying media |
MAJOR
- <video>
- <video>
- <video>
- <video>
- <video>
- and 15 more
|
| HY-01 | Missing doctype |
pass |
| HY-02 | Missing title |
pass |
| HY-03 | Missing language |
pass |
| HY-04 | Missing charset |
pass |
| HY-05 | Missing alt text |
pass |
| FT-01 | Web fonts |
pass |
| RQ-01 | Excessive requests |
1 minor
|
| FR-01 | First-party frame |
pass |
History
| Date | Grade | Majors | Minors |
Weight | Requests |
|---|
| 2026-09-29 |
F |
4 |
1 |
251 KB |
117 |
| 2026-09-15 |
F |
4 |
1 |
240 KB |
113 |
| 2026-08-31 |
F |
4 |
1 |
253 KB |
117 |
| 2026-08-17 |
F |
4 |
1 |
252 KB |
122 |