{"action":"closed","issue":{"url":"https://api.github.com/repos/mathjax/MathJax/issues/1416","repository_url":"https://api.github.com/repos/mathjax/MathJax","labels_url":"https://api.github.com/repos/mathjax/MathJax/issues/1416/labels{/name}","comments_url":"https://api.github.com/repos/mathjax/MathJax/issues/1416/comments","events_url":"https://api.github.com/repos/mathjax/MathJax/issues/1416/events","html_url":"https://github.com/mathjax/MathJax/issues/1416","id":140966649,"number":1416,"title":"mml2jax preprocessor ignores preview: 'none' setting","user":{"login":"matijs","id":406439,"avatar_url":"https://avatars.githubusercontent.com/u/406439?v=3","gravatar_id":"","url":"https://api.github.com/users/matijs","html_url":"https://github.com/matijs","followers_url":"https://api.github.com/users/matijs/followers","following_url":"https://api.github.com/users/matijs/following{/other_user}","gists_url":"https://api.github.com/users/matijs/gists{/gist_id}","starred_url":"https://api.github.com/users/matijs/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/matijs/subscriptions","organizations_url":"https://api.github.com/users/matijs/orgs","repos_url":"https://api.github.com/users/matijs/repos","events_url":"https://api.github.com/users/matijs/events{/privacy}","received_events_url":"https://api.github.com/users/matijs/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/mathjax/MathJax/labels/Expected%20Behavior","name":"Expected Behavior","color":"3463b3"}],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":5,"created_at":"2016-03-15T13:08:29Z","updated_at":"2016-03-15T20:44:56Z","closed_at":"2016-03-15T20:44:56Z","body":"Using:\r\n```javascript\r\nMathJax.Hub.Config({\r\n  mml2jax: {\r\n    preview: 'none'\r\n  }\r\n});\r\n```\r\nto disable the preview still results in a `<span class=\"MathJax_Preview\"/>` ending up in the DOM. This in combination with the (new?) fast-preview extension (that seems to be enabled by default) resulted in two (or in the case of Firefox, OS X and iOS three) displays/renders of formulas with accompanying jumps of the page. First the MathML, followed by a flash of fast-preview followed by the final rendering of the formula.\r\n\r\nSee https://jsfiddle.net/j63fogqo/1/ for an example. Uncomment the disabling of 'fast-preview' to see one render less."}}