Prompt max length

Question

Using prompt() I am generating some html to and need to know the maximum length that I can put in the popup.

I can't find anything in the spec about this, wondering if someone can help

Answer 1

Here are some real world numbers in case anyone is interested. Please add more if you have any.

Using the following code in the browser console:

s = prompt("a", Array(SOME_NUMBER).join("0")); s.length;

• Chrome 43 - 2000 with ellipses as mentioned by @Redzarf.
• Firefox 39 - Reached 10,000,000 then stopped testing (browser runs slowly while this is executing. You may get the 'non responsive script' alert as well).
• IE 11 - Reached 10,000,000 then stopped testing.

Answer 2

The ECMAScript Programming Language Specification does not specify any maximum length. The maximum length with will be implementation-specific i.e, based on available memory.