Javascript

https://stackoverflow.com/questions/43958335/select-folder-instead-of-single-file-input
https://stackoverflow.com/questions/14425007/get-metadata-of-local-mp3-file-using-html5-filesystem-api
https://stackoverflow.com/questions/3544898/what-does-a-colon-mean-within-an-html-id-attribute
https://stackoverflow.com/questions/441018/replacing-spaces-with-underscores-in-javascript
https://stackoverflow.com/questions/42526032/how-to-find-if-element-with-specific-id-exists-or-not/42526074
https://stackoverflow.com/questions/4250364/how-to-trim-a-file-extension-from-a-string-in-javascript
https://stackoverflow.com/questions/19331606/onclick-add-image-to-div
https://www.google.se/search?q=select+local+file+play+with+html5&oq=select+local+file+play+with+html5
Detect if HTML5 video is playing or paused and show or hide a Div accordingly
https://stackoverflow.com/questions/31307146/javascript-button-stop-all-audio-on-page
https://stackoverflow.com/questions/3623110/get-an-elements-id
https://www.google.com/search?q=javascript+store+data+inside+a+div&ie=utf-8&oe=utf-8&client=firefox-b
https://stackoverflow.com/questions/5785833/how-to-change-link-hrefs-via-javascript
Using files from web applications

HTML & CSS

Everything You Need to Know About HTML’s ‘pre’ Element

CSS selector last row from main table
https://stackoverflow.com/questions/16010791/css-selector-last-row-from-main-table

Google search – “html5 canvas layers transparency”
https://www.google.se/search?q=html5+canvas+layers+transparency

Tutorial: How To Style the HTML 5 Audio Player
https://serversideup.net/style-the-html-5-audio-element/

Play local video file with HTML5
https://jsfiddle.net/dsbonev/cCCZ2/

Use Fetch as Google for websites
https://support.google.com/webmasters/answer/6066468?hl=en

hreview-examples
http://microformats.org/wiki/hreview-examples

PDF from every page of website
https://mpdf.github.io/real-life-examples/pdf-from-every-page-of-website.html

Google: php add protection to existing pdf
https://www.google.se/search?q=php+add+protection+to+existing+pdf

Custom colored Bootstrap button
https://codepen.io/anon/pen/RdBqbY
http://blog.koalite.com/bbg/

Styling checkboxes
https://stackoverflow.com/questions/49355676/trying-to-change-color-of-custom-checkbox-label-when-checked-css-only

Text
Background
Border (darken background 10%)
Active (darken background 7.5%)