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On my Linux system F1 does not work!
I put my cursor on render as in "tmpl.render" type F1 and a page about the editor https://www.jetbrains.com/help/idea/2016.2/intellij-idea-editor.html?utm_source=from_product&utm_medium=help_link&utm_campaign=__PACKAGE_CODE__&utm_content=2016.2.4
comes up in my default browser!
Diego Camacho9,332 Points
Try this, put the cursor on render and then press (CTRL + Q).
If doesn't work you can see the keymaps to do it on View menu -> Quick Documentation.
However I was able to get shift-F1 to work, but only after I followed this advise on stack overflow! http://stackoverflow.com/questions/8587522/how-to-view-jdk-external-documentation-in-intellij-idea#8589892