In the PhET Development Overview, comment style is defined such that
Comments should not extend beyond 120 columns, and line breaks should be inserted for multi-line comments just before word that would extend beyond 120th column. Code lines should also be broken up if they pass 120 columns.
I notice that in files like Spring.js, ParametricSpringControls.js, IntroSystemNode.js, ParallelSystemsNode.js, SeriesSystemNode.js, line breaks are inserted well before the 120th character.
120 is an upper limit, there's no requirement to extend each comment line to that limit. I prefer to break lines where it feels most natural and readable.
In the PhET Development Overview, comment style is defined such that
I notice that in files like Spring.js, ParametricSpringControls.js, IntroSystemNode.js, ParallelSystemsNode.js, SeriesSystemNode.js, line breaks are inserted well before the 120th character.