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Denis KrizanovicDenis Krizanovic 

lightning canvasapp mask


I have a canvas app that frames a sharepoint site. Works perfectly in Classic. In lightning, when I click on the iframed page, it opens the iframe across the whole width of the screen, within the Account tab. I can see that there is a html dom element that does this ( see below). When I remove it with developer tools, I get the ability to interact with my iframed page. 

Why is this "mask" here? How can I remove it?

<a class="mask" title="SharepointLib" href="javascript:void(0);" data-aura-rendered-by="1893:0"><span class="assistiveText" data-aura-rendered-by="1894:0">Expand</span></a>