html - Add Visibility:Hidden effect and keep <a href> download ability -

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my situation bit tricky , hard explain, can clearly.

on website need click on , downloads image, object click on must allow :hover psuedo class change image on :hover.

how i've set follows:

http://jsfiddle.net/6nutv/

if remove visibility:hidden html, image appears , browsers' download function becomes available. can choose image img src= is, adding visibilty:hidden disable download ability.

to reiterate - need you hover on prof_wl_btn , downloads <a>'s href=... image , on hover/mouseover prof_wl_btn changes it's background position (so far using psuedo class).

possible methods

1: use javascript onmouseover , z-index, can't z-index work here...

2: tried using css attribute clip:rect(xpx,xpx,xpx,xpx); crops everything.

if unclear i'm sorry, hard explain! can't find other post this.

ok rewrite, since op clarified in comments.

you can either have background image shifts on :hover, or if image must in html can indeed move on :hover of parent, if wanted alt text show won't happen here.

<a href="downloadlink"><img src="someiimg" alt="download ze image, yes"></a>

make 1 large image (someimg) showing both states (normal/hover). can top bottom or side-to-side. top-bottom. let's image want show w 40px h 40px. new sprite image showing both states, if top-bottom, w 40px h 80px;

  • set anchor block context (display: block, float, whatever).
  • set height , width on teh anchor equal amount of image want viewer see (so in case, width , height of anchor 40px).
  • set anchor overflow hidden. should see 40 x 40 part of image want users see before anything.

you can either set anchor position:relative , img position: absolute, or leave them , use negative margins (you'll have make img in block context this). let's latter:

a img { display: block; }

a:hover img, a:focus img { margin-top: -40px; }

because anchor has overflow hidden, you'll still see 40 x 40 window of image, see bottom part. bonus keyboard working there too.

if want use positioning, you'd relative-position anchor, absolute-position img, set image in normal state top: 0 , left: 0, , on hover/focus of image set top: -40px;


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