Rich-Harris

Stuff I wish I'd known sooner about service workers

I recently had several days of extremely frustrating experiences with service workers. Here are a few things I've since learned which would have made my life much easier but which isn't particularly obvious from most of the blog posts and videos I've seen.

I'll add to this list over time – suggested additions welcome in the comments or via twitter.com/rich_harris.

Use Canary for development instead of Chrome stable

Chrome 51 has some pretty wild behaviour related to console.log in service workers. Canary doesn't, and it has a load of really good service worker related stuff in devtools.

p3t3r67x0

Styling native elements

Native HTML controls are a challenge to style. You can style any element in the web platform that uses Shadow DOM with a pseudo element ::pseudo-element or the /deep/ path selector.

video::webkit-media-controls-timeline {
  background-color: lime;
}

video /deep/ input[type=range] {

marcoscaceres

Conclusions

updated on 19th of December

Thanks everyone who participated in the discussion! It was tremendously userful

So, what we are going to do initially is only support:

<link rel="manifest" href="...some URL...">

brucelawson

[My initial list:]

DRM
speed for superhi-perf games
app store placement
source-code secrecy

[list compiled from other people's twitter answers; thanks all!]

pushing native notifications when they're not in the "app" (several people said this)

zachleat

// * iOS zooms on form element focus. This script prevents that behavior.
// * <meta name="viewport" content="width=device-width,initial-scale=1">
//      If you dynamically add a maximum-scale where no default exists,
//      the value persists on the page even after removed from viewport.content.
//      So if no maximum-scale is set, adds maximum-scale=10 on blur.
//      If maximum-scale is set, reuses that original value.
// * <meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=2.0,maximum-scale=1.0">
//      second maximum-scale declaration will take precedence.
// * Will respect original maximum-scale, if set.
// * Works with int or float scale values.