Nurullah Sevinçtekin nurullah

Advanced SCSS

Or, 16 cool things you may not have known your stylesheets could do. I'd rather have kept it to a nice round number like 10, but they just kept coming. Sorry.

I've been using SCSS/SASS for most of my styling work since 2009, and I'm a huge fan of Compass (by the great @chriseppstein). It really helped many of us through the darkest cross-browser crap. Even though browsers are increasingly playing nice with CSS, another problem has become very topical: managing the complexity in stylesheets as our in-browser apps get larger and larger. SCSS is an indispensable tool for dealing with this.

This isn't an introduction to the language by a long shot; many things probably won't make sense unless you have some SCSS under your belt already. That said, if you're not yet comfy with the basics, check out the aweso

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.

Download This sample on Google Play Store

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.~~

	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));
	});

	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"

	<!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;

	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	;;;
	;;; 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