Nurullah Sevinçtekin nurullah

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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.~~

Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

	(async function () {
	async function loadFonts () {
	if (!('FontFace' in window)) {
	return;
	}

	const fonts = [
	new FontFace('theinhardt', 'url(/fonts/akzidenz-grotesk/AkzidenzGrotesk-Light.woff2)'), // 400
	new FontFace('theinhardt', 'url(/fonts/akzidenz-grotesk/AkzidenzGrotesk-Regular.woff2)'), // 500
	new FontFace('theinhardt', 'url(/fonts/akzidenz-grotesk/AkzidenzGrotesk-Medium.woff2)'), // 600

	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	;;;
	;;; Copyright (C), zznop, [email protected]
	;;;
	;;; This software may be modified and distributed under the terms
	;;; of the MIT license. See the LICENSE file for details.
	;;;
	;;; DESCRIPTION
	;;;
	;;; This PoC shellcode is meant to be compiled as a blob and prepended to a ELF

	<!doctype html>
	<!-- This is just a very slightly modified tracking.js demo: https://trackingjs.com/examples/face_camera.html -->
	<html>
	<head>
	<meta charset="utf-8">
	<script src="https://cdnjs.cloudflare.com/ajax/libs/tracking.js/1.1.3/tracking-min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/tracking.js/1.1.3/data/face-min.js"></script>
	<style>
	video, canvas {
	margin-left: 100px;

	function ydl()
	{
	youtube-dl --extract-audio --audio-format mp3 "$@" --ignore-errors
	}
	# youtube-dl: https://rg3.github.io/youtube-dl/
	# ornek: ydl "https://www.youtube.com/playlist?list=PL55713C70BA91BD6E"

	function getHightlightCoords() {
	var pageIndex = PDFViewerApplication.pdfViewer.currentPageNumber - 1;
	var page = PDFViewerApplication.pdfViewer.getPageView(pageIndex);
	var pageRect = page.canvas.getClientRects()[0];
	var selectionRects = window.getSelection().getRangeAt(0).getClientRects();
	var viewport = page.viewport;
	var selected = selectionRects.map(function (r) {
	return viewport.convertToPdfPoint(r.left - pageRect.x, r.top - pageRect.y).concat(
	viewport.convertToPdfPoint(r.right - pageRect.x, r.bottom - pageRect.y));
	});

	license: gpl-3.0
	redirect: https://observablehq.com/@d3/focus-context