JQuery creates "placeholder" attribute on every input element

[ontwerpen@…]

Somehow JQuery silently creates an empty "placeholder" attribute on every input element. Try it out on the JQuery homepage with

$("input:first").attr("placeholder")

or native

document.querySelector("input").placeholder

Both will give "" as a result, while really they should be undefined (compare with a page with an input and no JQuery).

This needs to be fixed because in the current situation, it is impossible to detect whether an *empty* placeholder attribute is present or *no* placeholder attribute is present. This can hinder development of plugins that show custom placeholders.

[sindresorhus]

 jQuery does return undefined. You can't use the frontpage as a test, since it's using an older jQ version.