{"action":"created","issue":{"url":"https://api.github.com/repos/whatwg/html/issues/2424","repository_url":"https://api.github.com/repos/whatwg/html","labels_url":"https://api.github.com/repos/whatwg/html/issues/2424/labels{/name}","comments_url":"https://api.github.com/repos/whatwg/html/issues/2424/comments","events_url":"https://api.github.com/repos/whatwg/html/issues/2424/events","html_url":"https://github.com/whatwg/html/issues/2424","id":212836353,"number":2424,"title":"selectionStart/selectionEnd behavior needs to be specified","user":{"login":"bzbarsky","id":1457979,"avatar_url":"https://avatars1.githubusercontent.com/u/1457979?v=4","gravatar_id":"","url":"https://api.github.com/users/bzbarsky","html_url":"https://github.com/bzbarsky","followers_url":"https://api.github.com/users/bzbarsky/followers","following_url":"https://api.github.com/users/bzbarsky/following{/other_user}","gists_url":"https://api.github.com/users/bzbarsky/gists{/gist_id}","starred_url":"https://api.github.com/users/bzbarsky/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bzbarsky/subscriptions","organizations_url":"https://api.github.com/users/bzbarsky/orgs","repos_url":"https://api.github.com/users/bzbarsky/repos","events_url":"https://api.github.com/users/bzbarsky/events{/privacy}","received_events_url":"https://api.github.com/users/bzbarsky/received_events","type":"User","site_admin":false},"labels":[{"id":570939278,"url":"https://api.github.com/repos/whatwg/html/labels/interop","name":"interop","color":"c5def5","default":false},{"id":402537936,"url":"https://api.github.com/repos/whatwg/html/labels/topic:%20forms","name":"topic: forms","color":"009800","default":false}],"state":"open","locked":false,"assignee":{"login":"domenic","id":617481,"avatar_url":"https://avatars0.githubusercontent.com/u/617481?v=4","gravatar_id":"","url":"https://api.github.com/users/domenic","html_url":"https://github.com/domenic","followers_url":"https://api.github.com/users/domenic/followers","following_url":"https://api.github.com/users/domenic/following{/other_user}","gists_url":"https://api.github.com/users/domenic/gists{/gist_id}","starred_url":"https://api.github.com/users/domenic/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/domenic/subscriptions","organizations_url":"https://api.github.com/users/domenic/orgs","repos_url":"https://api.github.com/users/domenic/repos","events_url":"https://api.github.com/users/domenic/events{/privacy}","received_events_url":"https://api.github.com/users/domenic/received_events","type":"User","site_admin":false},"assignees":[{"login":"domenic","id":617481,"avatar_url":"https://avatars0.githubusercontent.com/u/617481?v=4","gravatar_id":"","url":"https://api.github.com/users/domenic","html_url":"https://github.com/domenic","followers_url":"https://api.github.com/users/domenic/followers","following_url":"https://api.github.com/users/domenic/following{/other_user}","gists_url":"https://api.github.com/users/domenic/gists{/gist_id}","starred_url":"https://api.github.com/users/domenic/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/domenic/subscriptions","organizations_url":"https://api.github.com/users/domenic/orgs","repos_url":"https://api.github.com/users/domenic/repos","events_url":"https://api.github.com/users/domenic/events{/privacy}","received_events_url":"https://api.github.com/users/domenic/received_events","type":"User","site_admin":false}],"milestone":null,"comments":28,"created_at":"2017-03-08T19:44:52Z","updated_at":"2018-02-27T18:14:05Z","closed_at":null,"author_association":"COLLABORATOR","body":"Right now the spec is pretty much silent on how this stuff works, and as a result browsers have all sorts of behavior differences, both internally and across browsers.  Some examples:\r\n\r\n1. In Chrome, `var x = document.createElement(tag); x.defaultValue = \"abc\"; alert(x.selectionStart);` will alert 0 if `tag` is `\"input\"` but 3 if `tag` is `\"textarea\"`.\r\n\r\n2. In Safari, `var x = document.createElement(\"textarea\"); x.defaultValue = \"abc\"; alert(x.selectionStart);` alerts 0.  So do `var x = document.createElement(\"textarea\"); document.body.appendChild(x); x.defaultValue = \"abc\"; alert(x.selectionStart);` and `var x = document.createElement(\"textarea\"); x.selectionStart = x.selectionStart; x.defaultValue = \"abc\"; alert(x.selectionStart);`.  But `var x = document.createElement(\"textarea\"); document.body.appendChild(x); x.selectionStart = x.selectionStart; x.defaultValue = \"abc\"; alert(x.selectionStart);` alerts 3.\r\n\r\n3. In Gecko... there are various inconsistencies, esp between textarea vs input, display:none vs non-display-none, etc.  I'm fixing some of this stuff right now, so not sure it's worth going into the details, which are changing.\r\n\r\nOK, what does the spec actually say?  It says that setting the \"value\" IDL attribute of an input that is in \"value\" mode will move the text entry cursor (if there is one!) to the end of the text.\r\n\r\nIt also says that setting the \"value\" IDL attribute of textarea should do the same thing.\r\n\r\nIt says that UAs must \"follow platform conventions to determine their initial state\" for the text entry cursor and selection.\r\n\r\nThat's it.  There's no indication of how this initial state should get modified when the value or default value changes..."},"comment":{"url":"https://api.github.com/repos/whatwg/html/issues/comments/368973524","html_url":"https://github.com/whatwg/html/issues/2424#issuecomment-368973524","issue_url":"https://api.github.com/repos/whatwg/html/issues/2424","id":368973524,"user":{"login":"emanchado","id":65728,"avatar_url":"https://avatars0.githubusercontent.com/u/65728?v=4","gravatar_id":"","url":"https://api.github.com/users/emanchado","html_url":"https://github.com/emanchado","followers_url":"https://api.github.com/users/emanchado/followers","following_url":"https://api.github.com/users/emanchado/following{/other_user}","gists_url":"https://api.github.com/users/emanchado/gists{/gist_id}","starred_url":"https://api.github.com/users/emanchado/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/emanchado/subscriptions","organizations_url":"https://api.github.com/users/emanchado/orgs","repos_url":"https://api.github.com/users/emanchado/repos","events_url":"https://api.github.com/users/emanchado/events{/privacy}","received_events_url":"https://api.github.com/users/emanchado/received_events","type":"User","site_admin":false},"created_at":"2018-02-27T18:14:05Z","updated_at":"2018-02-27T18:14:05Z","author_association":"NONE","body":"Ok, see different approach in the branch [`selection-and-cursor-processing-input-textarea`](https://github.com/emanchado/web-platform-tests/tree/selection-and-cursor-processing-input-textarea) (commit [852ec69](https://github.com/emanchado/web-platform-tests/commit/852ec695bdb4b7a5017b35e5dd5c3fb8f23690bc)). Sorry for the delay, I've been busy.\r\n\r\nIt's obviously incomplete, but I seem to be getting better results:\r\n\r\n* The first two tests (for `defaultValue`) behave differently in Firefox and Chrome.\r\n* The `color` type switching test fails in both (in different ways, too). I wonder if this has defined behaviour and/or it's important.\r\n\r\nComments welcome. If this looks good now, I'll keep going and will try to cover all the mentioned cases."}}
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