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2020-02-16 20:05:53 +0200	asked a question	SageMath Tutorials not working inside JupyterLab Summary: When I select Help for sagemath from the menu in Jupyterlab, the browser throws "`allow-same-origin`" errors in the console and eventually stops processing pages completely, showing "`math processing error`" for all formulas. I am trying to add SageMath to our existing JupyterLab 1.2.6 installation inside a docker with an Ubuntu 18.04 image. I installed SageMath 9.0 and added SageMath to Jupyter via `jupyter kernelspec install ./local/share/jupyter/kernels/sagemath`. Everything seems to run fine, except for the help: I select "Sage Documentation" from the Help menu in a SageMath notebook In the Web Browser console I get `The document is sandboxed and lacks the allow-same-origin flag`. While the document seems to be working anyway, going through the doucmentation yields an error for every single formula it encounters, specifically: `Access to font at XX (mathjax-font) from origin null has been blocked by CORS policy, No Access-Control-Allow-Origin header is present on the requested resource`. Still, it seems to be working somewhat, I think with the wrong fonts, but readable. At some point MathJax stops processing formulas completely and shows `Math Processing Error` for each formula. I already tried setting allow-origin in the notebook configuration, but that did not change anything. Anybody has a clue? Frank
2020-02-16 20:05:53 +0200	asked a question	same-origin errors for SageMath tutorial inside Jupyterlab Summary: When I select Help for sagemath from the menu in Jupyterlab, the browser throws "`allow-same-origin`" errors in the console and eventually stops processing pages completely, showing "`math processing error`" for all formulas. I am trying to add SageMath to our existing JupyterLab 1.2.6 installation inside a docker with an Ubuntu 18.04 image. I installed SageMath 9.0 and added SageMath to Jupyter via `jupyter kernelspec install ./local/share/jupyter/kernels/sagemath`. Everything seems to run fine, except for the help: When I select "Sage Documentation" from the Help menu, in the Web Browser console I get `The document is sandboxed and lacks the allow-same-origin flag`. While the document seems to be working anyway, going through the doucmentation yields an error for every single formula it encounters, specifically: `Access to font at XX from origin null has been blocked by CORS policy, No Access-Control-Allow-Origin header is present on the requested resource`. Still, it seems to be working somewhat, I think with the wrong fonts, but readable. However, at some point MathJax stops processing formulas completely and shows `Math Processing Error` for each formula. I already tried setting allow-origin in the notebook configuration, but that did not change anything. Anybody has a clue?