As and when the user scrolls the page ...

Is this correct English?
The context is: A person is describing scrolling on the web page.
Not sure if the "As and" part is correct or it adds any extra meaning to the sentence. Instead of saying "As and when" one could say "when the user scrolls the page..." will it mean the same thing?

  • It's a kind of sloppy speech that shouldn't get past a copyeditor. It is probably inspired by "if and when", which is more common.
    – ralph.m
    May 30 at 10:26
  • I don't think it's "sloppy". Maybe it's not quite as common as if and when, but semantically and syntactically I see no problem with it. On the other hand, if and when is definitely a bit "weird" on the semantic front. We don't often say if OR when, but logically that would make more sense! May 30 at 11:02
  • The grammar is technically acceptable, but the usage is wrong and the style is terrible. Just use one or the other
    – gotube
    May 30 at 19:10
  • Did you look up the meanings of "as" and "when" (as you're using them here)? Are the meanings similar or different? May 30 at 19:22

1 Answer 1


The most common context for the collocation as and when X is in "imperative" statements and similar (giving advice / permission / ...) where X defines the conditions when the advice / permission applies...

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Note that most of the above matches will be in imperative contexts like Take one of these pain killer tablets as and when required. The construction is less common in contexts like OP's (as and when an action is being performed), but it's still perfectly natural to this native speaker.

The difference between using both terms (when either on its own should be sufficient) is simply a nuance of emphasis. You can understand as and when as carrying the sense of every time, whenever.

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