NAME

       wml::des::preload - Preload Images

SYNOPSIS

        #use wml::des::preload

        <preload src=<image filename> via=<trick>>

DESCRIPTION

       This include file provides the "<preload>" tag which can be used to preload images. Such preloading is
       usually done to speedup access for following pages. Currently there are only a few tricks how this can be
       done.

       The following combinations are currently supported:

       "src="anyimage "via=size"
           Preloads  the  image  anyimage  by  using an "<img>" tag with the attributes "width=1 height=1" which
           leads to the loading of the image but only to a 1 pixel in display.

           Advantage: Works for all browsers.

           Disadvantage: This approach has the nasty side-effect of an occurring  1  pixel  in  display  because
           "width=0  height=0"  does  not  work  as  expected in most browsers (especially in Netscape 4.x). So,
           position your "<preload>" tag somewhere it does not destroy the look and feel of your page.

       "src="anyimage "via=js"
           Preloads the image anyimage by using a JavaScript snippet which  loads  the  image  by  declaring  an
           unused "Image" object.

           Advantage: Silently preloads the image without displaying anything.

           Disadvantage: Only works for browsers with a JavaScript implementation and only for those who support
           the "Image" object (currently NS/3, NS/4, IE/4).

AUTHORS

        Ralf S. Engelschall
        rse@engelschall.com
        www.engelschall.com

        Denis Barbier
        barbier@engelschall.com

REQUIRES

        Internal: P1, P2
        External: --

SEE ALSO

       wml::std::tags(3) HTML 3.2 "<img>" tag.

EN Tools                                           2020-11-29                               wml::des::preload(3)