Благодаря усилиям Винсента и работы Joey Hayes, у меня есть этот codepen , работающий на мобильном телефоне Android, который поддерживает несколько фиксированных фонов
HTML:
Fixed backgrounds on a mobile browser
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CSS:
* {
box-sizing: border-box;
}
body {
font-family: "source sans pro";
font-weight: 400;
color: #fdfdfd;
}
body > section >.footer {
overflow: hidden;
}
nav {
position: fixed;
top: 0;
left: 0;
height: 70px;
width: 100%;
background-color: silver;
z-index: 999;
text-align: center;
font-size: 2em;
opacity: 0.8;
}
article {
position: relative;
font-size: 1em;
}
section {
height: 100vh;
padding-top: 5em;
}
.bg-img::before {
position: fixed;
content: ' ';
display: block;
width: 100vw;
min-height: 100vh;
top: 0;
bottom: 0;
left: 0;
right: 0;
background-position: center;
background-size: cover;
z-index: -10;
}
.bg-img1:before {
background-image: url('https://res.cloudinary.com/djhkdplck/image/upload/v1491326836/3balls_1280.jpg');
}
.bg-img2::before {
background-image: url('https://res.cloudinary.com/djhkdplck/image/upload/v1491326840/icebubble-1280.jpg');
}
.bg-img3::before {
background-image: url('https://res.cloudinary.com/djhkdplck/image/upload/v1491326844/soap-bubbles_1280.jpg');
}
h1, h2, h3 {
font-family: lato;
font-weight: 300;
text-transform: uppercase;
letter-spacing: 1px;
}
.content {
max-width: 50rem;
margin: 0 auto;
}
.solid {
min-height: 100vh;
width: 100%;
margin: auto;
border: 1px solid white;
background: rgba(255, 255, 255, 0.6);
}
.footer {
background: rgba(2, 2, 2, 0.5);
}
JS / JQUERY
window.onload = function() {
// Alternate Background Page with scrolling content (Bg Pages are odd#s)
var $bgImg = $('.bg-img');
var $nav = $('nav');
var winh = window.innerHeight;
var scrollPos = 0;
var page = 1;
var page1Bottom = winh;
var page3Top = winh;
var page3Bottom = winh * 3;
var page5Top = winh * 3;
var page5Bottom = winh * 5;
$(window).on('scroll', function() {
scrollPos = Number($(window).scrollTop().toFixed(2));
page = Math.floor(Number(scrollPos / winh) +1);
if (scrollPos >= 0 && scrollPos < page1Bottom ) {
if (! $bgImg.hasClass('bg-img1')) {
removeBg( $bgImg, 2, 3, 1 ); // element, low, high, current
$bgImg.addClass('bg-img1');
}
} else if (scrollPos >= page3Top && scrollPos <= page3Bottom) {
if (! $bgImg.hasClass('bg-img2')) {
removeBg( $bgImg, 1, 3, 2 ); // element, low, high, current
$bgImg.addClass('bg-img2');
}
} else if (scrollPos >= page5Top && scrollPos <= page5Bottom) {
if (! $bgImg.hasClass('bg-img3')) {
removeBg( $bgImg, 1, 2, 3 ); // element, low, high, current
$bgImg.addClass('bg-img3');
}
}
$nav.html("Page# " + page + " window position: " + scrollPos);
});
}
// This function was created to fix a problem where the mouse moves off the
// screen, this results in improper removal of background image class. Fix
// by removing any background class not applicable to current page.
function removeBg( el, low, high, current ) {
if (low > high || low <= 0 || high <= 0) {
console.log ("bad low/high parameters in removeBg");
}
for (var i=low; i<=high; i++) {
if ( i != current ) { // avoid removing class we are trying to add
if (el.hasClass('bg-img' +i )) {
el.removeClass('bg-img' +i );
}
}
}
} // removeBg()