Browser/web apps access to secure surface

Embodiments are directed towards generating an image from a plurality of content layers. The content layers may include secure content that overlaps at least one other content layer. When the image is generated, the secure content may be rendered as a layer below the plurality of content layers. Additionally, each area of content layers that is overlapped by an area of the secure content may be modified to be transparent, where the area of the secure content is visible in the image through each transparently modified area. In some embodiments, an alpha channel value of each pixel in each area of content layers that is overlapped by the secure content may be modified. Secure content and unsecure content at a same layer may be split into different layers, where the unsecure content layer may be rendered at a theoretical secure content layer.