javascript - mousemove event is triggered onscroll even when mouse was not moved on chrome -


i trying answer issue custom drop down, challenged inconsistent behavior in chrome , ff.

demo: http://jsfiddle.net/fyeht/ [added scroll event more clarity]

see below image, list items can navigated using arrow keys.

to reproduce issue:

  1. open console in chrome (f12)
  2. click on item in list (you notice events getting logged in console)
  3. use down arrow key navigate next item in list
  4. finally, issue noticed when reach last item in view , hitting down arrow scroll. check log see 'scroll', 'mouse enter' , 'mouse move' [check new demo]

the issue after reaching end of items in view, scrolls. though mouse untouched, triggers mouseenter , mousemove events in chrome. in ff, on scroll triggers mouseenter make sense.

enter image description here

question(s):

  • why mousemove triggered when mouse untouched?
  • is browser inconsistency? not find documentation on events triggered when scrolling? (never knew did)

submitted bug report: https://code.google.com/p/chromium/issues/detail?id=241476

in example, see both chrome , ff firing mouseenter dom events whenever mouse left hovering on <ul> , pressing key down triggers browser scroll in order bring selected <li> view.

however, chrome additionally triggering mousemove events. 1 obvious difference in mouseenter event objects 2 throw chrome, mouseevent.offsetx , mouseevent.offsety values included, whereas in ff these properties undefined. so, when enter triggered chrome has decided mouse "has moved".

since mouseevent.screenx , mouseevent.screeny event context values not change between scroll-triggered mouseevent instances, 1 perhaps distinguish between "artificial" mouseenter / mousemove event , "authentic" 1 storing these values prior events.

dom event specification

the dom level 2 event specification mousemove reads:

the mousemove event occurs when pointing device moved while on element.

the level 3 spec (working draft) same:

a user agent must dispatch event when pointing device moved while on element.

seems down whether 1 interprets "is moved" relatively or not.

also, in section of level 3 spec on mouse event order, states when pointer moved element, triggers mouseover, mouseenter, , mousemove, in order. every case specified there has 3 together, perhaps 1 might interpret if going trigger mouseenter event, should triggering mousemove event corresponds entering element.


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