How to set the default value for an HTML <select> element ? - GeeksforGeeks
How to Style Your Select Boxes
How to Create a Multiple Selection List Box in JavaScript for HTML5 and CSS3 Programming - dummies
html - How to reduce dropdown box width in the select box - Stack Overflow
How to Custom Style a Select Box with Form Value Support? - apptha
Moving elements or shifting options from one drop down list box to other in JavaScript
HTML Select Tag – How to Make a Dropdown Menu or Combo List
How to make a placeholder for a 'select' box? - GeeksforGeeks
GitHub - PhilippeMarcMeyer/vanillaSelectBox: A dropdown menu with lots of features that takes a select tag and transforms it into a single or multi- select menu with 1 or 2 levels