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USINGBROWSERSETTINGS
FORPERFORMANCE
WebPerfDays Amsterdam 2018
Walter Ebert
@walterebert
mastodon.social/@walterebert
Image: https://flic.kr/p/79eyNM
THEBEGINNING:
BACKGROUNDVIDEOS
<video autoplay loop muted playsinline controls>
<source src="video.webm" type='video/webm;codecs="vp9,opus"'>
<source src="video.mp4" type="video/mp4">
</video>
MOBILE
<video autoplay loop muted playsinline controls>
<source src="vid.mp4" media="(min-width: 1280px)" type="video/mp4">
<img src="screenshot.jpg" alt="Video screenshot">
</video>
MOBILE
Problem: Video media query support has been
removed from Google Chrome 34+
<video autoplay loop muted playsinline controls>
<source src="vid.mp4" media="(min-width: 1280px)" type="video/mp4">
<img src="screenshot.jpg" alt="Video screenshot">
</video>
LOADWITHJAVASCRIPT
<video id="video" preload="none" loop muted playsinline controls
poster="data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.o
src="small.mp4"
</video>
<script>
var video = document.getElementById('video')
if (is_mobile()) {
video.setAttribute('poster', 'screenshot.jpg')
} else {
video.setAttribute('src', 'large.mp4')
video.play()
}
</script>
ISMOBILE?
<script>
function is_mobile() {
var mobile = true
if (
!navigator.userAgent.match(/Mobi/) ||
window.screen.width > 1599 ||
window.matchMedia('(min-width: 1280px)').matches
) {
mobile = false
}
return mobile
}
</script>
REDUCEDMOTION
Safari, Firefox
<script>
var autoplay = true
if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) {
autoplay = false
}
</script>
PROPOSEDFORCSS5
light-level
inverted-colors
prefers-reduced-motion
prefers-reduced-transparency
prefers-contrast
prefers-color-scheme
Custom Media Queries
https://drafts.csswg.org/mediaqueries-5/#mf-user-preferences
DONOTTRACK
Ignoring DNT is a (potential) GDPR violation
HTTP Request Header
DNT: 1
<?php
if (empty($_SERVER['HTTP_DNT'])) {
echo '<script src="trackme.js" async></script>';
}
HIGHCONTRASTMODE(EDGE)
<style>
@media screen and (-ms-high-contrast: active) {
/* All high contrast styling rules */
}
</style>
<script>
if (window.matchMedia('(-ms-high-contrast: active)').matches) {
// High contrast code
}
</script>
https://msdn.microsoft.com/library/Hh771830
DARKMODE(SAFARI)
<style>
@media (prefers-color-scheme: dark) {
// Dark mode code
}
</style>
<script>
if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
// Dark mode code
}
</script>
JAVASCRIPTMODULES
<script type="module" src="main.mjs"></script>
<script nomodule src="fallback.js"></script>
JAVASCRIPTMODULES
Or maybe, no JS for old browsers
<script type="module" src="main.mjs"></script>
NETWORKINFORMATIONAPI
<script>
var connection = navigator.connection || navigator.mozConnection || n
if (
connection &&
(
connection.type === 'ethernet' ||
connection.type === 'wifi' ||
connection.type === '4g'
)
) {
// Do something
}
</script>
https://caniuse.com/#feat=netinfo
CLIENTHINTS
HTTP Request Headers
Accept: image/webp,image/*,*/*;q=0.8
Accept-CH: DPR, Width
Accept-CH: Viewport-Width
https://httpwg.org/http-extensions/client-hints.html
https://www.smashingmagazine.com/2016/01/leaner-responsive-images-client-hints/
https://caniuse.com/#feat=netinfo
QUESTIONS?
@walterebert
mastodon.social/@walterebert
walter.ebert.engineering

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