on https://golang.org/pkg/html/template/#hdr-Security_Model the first and second example the playground not displayed correctly:
all(AFAIK) other playground tabs are shown 100% visible.
EDIT:
this happens randomly, its not specifically this playground but it happens on random occasions.
firefox {nightly/dev/stable} and chromium {75.0.3770.100}
on https://golang.org/pkg/html/template/#hdr-Security_Model the first and second example the playground not displayed correctly:
all(AFAIK) other playground tabs are shown 100% visible.
EDIT:
this happens randomly, its not specifically this playground but it happens on random occasions.
firefox {nightly/dev/stable} and chromium {75.0.3770.100}