Hi,

This is how xterm is displayed with defaults.
I tried to change font-family & line height.
What is the problem?
I am using your startup example.
Hello, your issue looks like related to #1170
Had the same issue on debian buster/sid / Firefox ESR 52.8.1 (64-bit), fixed it by changing the font family to Courier New
const xterm = new Terminal({ fontFamily: 'Courier New' });
Hi,
I added fontFamily:'Courier New' option to constructor.
But nothing changed.
I added this to the constructor, which fixes the issue for me on Ubuntu 18.04 and Chrome 67:
const xterm = new Terminal({
fontSize: 14,
fontFamily: 'Ubuntu Mono, courier-new, courier, monospace'
});
Thank you @jan0e .
This solved my problem.
Most helpful comment
I added this to the constructor, which fixes the issue for me on Ubuntu 18.04 and Chrome 67: