If you run the following code in the browser console, then you get different results in Chromium and Safari.
String(function() { <!--
}).length
Chromium returns:
19
Safari returns:
20
Why?
Running via the StackOverflow code editor will deliver the same output, regardless of browser, probably due to the various levels of mediation between the raw output and the browser window.
The toString outputs rendered into the console, differ:
Chromium:
'function() { \x3C!--\n}'
Safari:
"function () { <!--
}"
This contains a correction of an earlier version of this question that presented incorrect interpretations of the result.
The reason here is not the different linebreak symbols, but in fact Safari adds a space before the () function parentheses in its syntax. Try this to compare the characters side by side more easily:
String(function() {
}).split("")
You will see that in Chrome, it will write it as
function()
whereas in Safari it becomes
function ().