I have custom icons that work fine on IOS and Android. When I deploy on the Web, a crossed out box appears in each place in the App where my icon should appear.
eventhandler
godbolt
vbo
java-calendar
visual-studio-express
business-process
express-ntlm
appium-ios
angular2-pipe
invalid-characters
unity-uss
jump-list
wso2-micro-integrator
background-blend-mode
python-ast
xelatex
tree-traversal
asm.js
javac
apple-app-site-associate
rpostgresql
vistime
sample-rate
hidden
urlloader
t-test
rpyc
ordereddict
kerberos
large-scale