Ludumdare - displays HTML5 games https://ldjam.com/events/ludum-dare/46/rescue-turtles-1/$200707

ldjam-html5-games.user.js

// ==UserScript==
// @name         Ludumdare - displays HTML5 games
// @namespace    ldjam-html5-games
// @version      4
// @homepageURL  https://ldjam.com/events/ludum-dare/46/rescue-turtles-1/displays-border-if-game-is-html5-or-not
// @updateURL    https://gist.github.com/A-312/de155f4753463dce1d8910ad859f944f/raw/ldjam-html5-games.user.js
// @downloadURL  https://gist.github.com/A-312/de155f4753463dce1d8910ad859f944f/raw/ldjam-html5-games.user.js
// @supportURL   https://gist.github.com/A-312/de155f4753463dce1d8910ad859f944f
// @description  Displays HTML5 games
// @author       A-312
// @match        https://ldjam.com/events/ludum-dare/*/games*
// @grant        none
// ==/UserScript==

window.addEventListener("keydown", function (e) {
  if (e.keyCode !== 120)
      return;
  (function HTML5only(A3i, list) {
    const match = list[A3i].href.match(/\/events\/ludum-dare\/(\d+)\/(.+)/)
    const session = match[1]
    const queryid = match[2]
    if (list[A3i].getAttribute('data-already') == '1') {
        return HTML5only(A3i+1, list)
    }
    const req = new XMLHttpRequest()
    req.responseType = 'json'
    req.open('GET', `https://api.ldjam.com/vx/node2/walk/1/events/ludum-dare/${session}/${queryid}?node`, true)
    req.onload = function() {
        try {
            const jsonResponse = req.response
            const meta = jsonResponse.node[0].meta
            const keys = Object.keys(meta).filter((a) => a.indexOf('-tag') !== -1)
            const found = keys.filter((a) => meta[a] == 42336)
            console.log(meta, keys, found)
            if (found.length > 0)
                list[A3i].style.border = '5px solid chartreuse'
            else
                list[A3i].style.border = '5px solid red'
        } catch (e) { console.error(e) }
        list[A3i].setAttribute('data-already', '1')
        HTML5only(A3i+1, list)
    };
    req.send(null)
  })(0, document.querySelectorAll('div.layout-container > div > a.button-base.button-link.content-box'))

  return false;
})

Thanks for the gist!

I added shortcuts to check other platforms too. Replace

if (e.keyCode !== 120)
      return;

with:

  if (e.keyCode !== 117 && e.keyCode !== 121 && e.keyCode !== 119 && e.keyCode !== 120)
      return;

  var searched_link_id;
  if (e.keyCode == 117) {
    // F6: Windows
    searched_link_id = 42337;
  } else if (e.keyCode == 121) {
    // F10: OSX
    searched_link_id = 42339;
  } else if (e.keyCode == 119) {
    // F8: Linux
    searched_link_id = 42341;
  } else if (e.keyCode == 120) {
    // F9: Web
    searched_link_id = 42336;
  }

then replace 42336 in the meta[a] check with searched_link_id

You'll need to refresh to run a different search though. You could remove data-already to allow re-running searches at will, but I fear about the implications in performance.

In addition, it only works if the developer added one link for each platform. Direct downloads and single links to itch.io, etc. won't be detected.

For now, going on itch and filtering by Ludum Dare tag + platform seems the best bet. But it only works for games on itch, and it cannot sort with the Ludum Dare need rating / smart karma system.