html选择重复的值“有效”？

Question

Is a select with repeated values “well formed” or “valid”? I've been looking for references to this with no luck. The reason i'm asking is a lot of frameworks give the syntax

-createSelect(array options, array selected, type, etc)-

and this options array is an associative array, implying there are not repeated values. But this https://jsfiddle.net/uqkzvd9s/ does not trigger any warning in the browser that i can see.

Answer 1

是的，HTML中没有限制可以在单个选择元素中使用特定值的次数的限制。