Here are URLs you may want to use to test browsers' functionalities.
Reddit
https://reddit.com
Facebook
https://facebook.com
WhatsApp
https://api.whatsapp.com/send?phone=1234567890
data:text/plain;base64,SGVsbG8sIFdvcmxkIQ==
data:text/html,%3Ch1%3EHello%2C%20World%21%3C%2Fh1%3E
data:text/html,%3Cscript%3Ealert%28%27hi%27%29%3B%3C%2Fscript%3E
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAAEklEQVQIW2P8z8AARAwMjDAGACwBA/+8RVWvAAAAAElFTk
Mailto
mailto:text@example.com : Includes email, subject, body, cc and bcc. Though I have yet to find an email client that supports cc and bcc.Tel
tel:+123456789Amazon
http://amazon.deGoogle Play
Fulguris on Google PlayTelegram
https://t.me/durovData
HTML base64
Hello World HTML document base64 encoded:data:text/plain;base64,SGVsbG8sIFdvcmxkIQ==
HTML URI
Hello World HTML document URI encoded:data:text/html,%3Ch1%3EHello%2C%20World%21%3C%2Fh1%3E
HTML JavaScript
HTML document text encoded with JavaScript alert:data:text/html,%3Cscript%3Ealert%28%27hi%27%29%3B%3C%2Fscript%3E
PNG base64
PNG base64 encoded 2 by 2 pixels red:data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAYAAABytg0kAAAAEklEQVQIW2P8z8AARAwMjDAGACwBA/+8RVWvAAAAAElFTk
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