{"action":"closed","issue":{"url":"https://api.github.com/repos/openlayers/ol3/issues/6304","repository_url":"https://api.github.com/repos/openlayers/ol3","labels_url":"https://api.github.com/repos/openlayers/ol3/issues/6304/labels{/name}","comments_url":"https://api.github.com/repos/openlayers/ol3/issues/6304/comments","events_url":"https://api.github.com/repos/openlayers/ol3/issues/6304/events","html_url":"https://github.com/openlayers/ol3/issues/6304","id":197666178,"number":6304,"title":"canvas map cannot be export","user":{"login":"jacobking","id":3759983,"avatar_url":"https://avatars.githubusercontent.com/u/3759983?v=3","gravatar_id":"","url":"https://api.github.com/users/jacobking","html_url":"https://github.com/jacobking","followers_url":"https://api.github.com/users/jacobking/followers","following_url":"https://api.github.com/users/jacobking/following{/other_user}","gists_url":"https://api.github.com/users/jacobking/gists{/gist_id}","starred_url":"https://api.github.com/users/jacobking/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jacobking/subscriptions","organizations_url":"https://api.github.com/users/jacobking/orgs","repos_url":"https://api.github.com/users/jacobking/repos","events_url":"https://api.github.com/users/jacobking/events{/privacy}","received_events_url":"https://api.github.com/users/jacobking/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":3,"created_at":"2016-12-27T08:24:04Z","updated_at":"2016-12-28T20:28:33Z","closed_at":"2016-12-28T20:28:33Z","body":"what's the rules of export map to png?I packaged map by wmts,but cannot export!Is there is a right way to export map otherwise right key ?here is the reference [http://openlayers.org/en/latest/examples/export-map.html?q=export](http://openlayers.org/en/latest/examples/export-map.html?q=export),this refrence's vector is build by GeoJSON,I build by wmts,that's the difference, here is my demo [https://jsfiddle.net/56Lc2749/4/](https://jsfiddle.net/56Lc2749/4/),\r\nhere is the error\r\n`Uncaught DOMException: Failed to execute 'toBlob' on 'HTMLCanvasElement': Tainted canvases may not be exported.`\r\n"}}
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