#ValidHTML

Live, measured metrics for the hashtag #ValidHTML from the open social web. Every number carries a named source and the time it was fetched. Nothing is estimated.

hashtag.org network · sponsored

Own #validhtml

This #name is available to claim. It becomes your portal on the open agent web: this very page, a keyword you rank for by an open public stake, and a verifiable identity for AI agents. Nobody else sells a page like this for every #name.

$51.02/ year · 9-character #name
Claim #validhtml — $51.02/yr→Buy on hashtag.space (web3)
card via hashtag.org · tokens via hashtag.space
0
Uses / 7 days
Mastodon
0
Accounts / 7 days
Mastodon
3
Recent posts
Mastodon
~0/hr
Recent pace
Mastodon · last 3
1.7
Avg reactions / post
Mastodon · last 3
—
Reddit posts / month
Reddit search
—
Open-web mentions
hashtag.org Firehose

Day-by-day usage

measured · mastodon.social (Mastodon public tags API) · fetched 2026-10-11 15:55 UTC
0
10-05
0
10-06
0
10-07
0
10-08
0
10-09
0
10-10
0
10-11

0 uses by 0 unique accounts across the window. Real per-day counts, not estimates. Newest bar is today so far.

Related hashtags

measured · mastodon.social (Mastodon public search API) · fetched 2026-10-11 15:55 UTC

No related tags with measured usage found for #validhtml.

Live pulse

measured · mastodon.social (Mastodon tag timeline) · fetched 2026-10-11 15:55 UTC

Everything below is measured over the latest 3 public posts (spanning ~24352 hours).

Posting hours (UTC)

00:0012:0023:00

Languages: English (3)

Avg boosts / post: 0.7

Top of the latest posts

  • 🟣 2023: 0 of the Global Top 100 Websites Use Valid HTML by Jens Oliver Meiert @j9t @j9t@mas.to #webdev #html #validHTML https://meiert.com/en/blog/html-conformance-2023/

    pablolarah@pablolarah♥ 4↻ 12023-11-01 22:34 UTCView post →

  • #Development #Findings 0.5% of the global top 200 websites use valid HTML · Almost all use faulty, non-existent, or broken HTML https://ilo.im/1602lf _____ #ValidHTML #Validation #Quality #Conformance #WebStandards #WebDev #Frontend #HTML

    Inautilo@inautilo♥ 1↻ 12024-09-13 01:05 UTCView post →

  • Only 2.6% of the most visited websites have fully valid HTML https://validatehtml.com/html-error-statistics Comments: https://news.ycombinator.com/item?id=49272326 #HackerNews #validhtml #webdevelopment #htmlstatistics #webdesign #technews

    Hacker News@h4ckernews♥ 0↻ 02026-08-12 14:12 UTCView post →

#validhtml across platforms

every network with a public tag surface

Follow #validhtml straight to each platform’s own tag page. Where a platform publishes open data we measure it above; the rest lock their numbers behind paid APIs, so we link rather than guess.

X (Twitter) ↗Instagram ↗TikTok ↗Facebook ↗LinkedIn ↗YouTube ↗Threads ↗Bluesky ↗Mastodon ↗Reddit ↗Pinterest ↗Tumblr ↗

Every number above is measured from a named public API at the shown fetch time. Nothing is estimated or extrapolated. Platforms that lock their data behind paid APIs are not shown. Agents: the same numbers, as JSON, at /api/hashtags/validhtml