{"action":"opened","issue":{"url":"https://api.github.com/repos/mathjax/MathJax/issues/1387","repository_url":"https://api.github.com/repos/mathjax/MathJax","labels_url":"https://api.github.com/repos/mathjax/MathJax/issues/1387/labels{/name}","comments_url":"https://api.github.com/repos/mathjax/MathJax/issues/1387/comments","events_url":"https://api.github.com/repos/mathjax/MathJax/issues/1387/events","html_url":"https://github.com/mathjax/MathJax/issues/1387","id":133581750,"number":1387,"title":"Math processing errors with MathJax 2.6.1 and CHTML","user":{"login":"samfromlv","id":1714331,"avatar_url":"https://avatars.githubusercontent.com/u/1714331?v=3","gravatar_id":"","url":"https://api.github.com/users/samfromlv","html_url":"https://github.com/samfromlv","followers_url":"https://api.github.com/users/samfromlv/followers","following_url":"https://api.github.com/users/samfromlv/following{/other_user}","gists_url":"https://api.github.com/users/samfromlv/gists{/gist_id}","starred_url":"https://api.github.com/users/samfromlv/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/samfromlv/subscriptions","organizations_url":"https://api.github.com/users/samfromlv/orgs","repos_url":"https://api.github.com/users/samfromlv/repos","events_url":"https://api.github.com/users/samfromlv/events{/privacy}","received_events_url":"https://api.github.com/users/samfromlv/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-02-14T21:26:38Z","updated_at":"2016-02-14T21:26:38Z","closed_at":null,"body":"We use MathJax for educational website www.yaklass.ru. Due rendering issues with MathJax 2.5 and new version of Chrome (line on the right of all formulas) we were forced to upgrade to 2.6. We decided to test CHTML output and started to get complaints from users about math display errors. For small fraction of users all math on the page were displayed as errors.\r\n\r\nScreenshot of the problem from one of our users (we use [-!-] as message in errorSettings)\r\n[user-screenshot](https://cloud.githubusercontent.com/assets/1714331/13036432/d4b487c4-d36f-11e5-9f79-a27983e0d1a0.jpg)\r\n\r\nWe were not able to reproduce this issue and deployed Google Analytics error tracking to collect some data before switching back to HTML-CSS output. \r\n\r\nOur code to track errors:\r\n\r\n` MathJax.Hub.Register.MessageHook(\"Math Processing Error\", function (message) {\r\n            try {\r\n                Yk.utils.trackEvent(\"MathJax/Error\", \"MathJax/Error/Processing\", message[2] + '', null, true);\r\n            }\r\n            catch (e) { }\r\n        });`\r\n\r\nWe collected errors for MathJax version 2.6.1 with CHTML.\r\n\r\nHere are errors by browser:\r\n[Analytics yaklassru Top Events 20160214-20160214.pdf](https://github.com/mathjax/MathJax/files/129892/Analytics.yaklassru.Top.Events.20160214-20160214.pdf)\r\n\r\nHere are page URLs (currently CHTML is disabled there, however formulas are the same that caused errors):\r\n[Google Doc](https://docs.google.com/spreadsheets/d/16bigG9RC4ipxz6Ahu1PGiHZ0e_2ERoy8pyFE0q85mWg/edit?usp=sharing)\r\n\r\nAfter switching back to HTML-CSS output we no longer see these errors.\r\nPlease let me know if any additional data from Google Analytics is required.\r\n\r\n\r\n\r\n\r\n\r\n\r\n"}}