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Building JavaScript Controls - I Programmer
This reference is not very useful, as presented, but the ideas shown can be used to build useful controls.
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jQuery UI components - jQueryui
jQueryui is a library of UI components, based on the jQuery JavaScript library. They don't have userControls, but are otherwise useful.
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jQuery library - jQuery
jQuery is a library that provides a number of abstractions over JavaScript that work across all current popular browsers.
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HTML Element Reference - w3schools
Very good, clear reference for HTML, with interactive examples.
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DOM Document Model - w3schools
Reference for the HTML DOM. The DOM interface is used by JavaScript to couple element behaviors with user actions.
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JavaScript Statements - w3schools
Simple, but fairly complete reference for JavaScript.
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JavaScript tutorial - javascript.info
Very clear tutorial, divided into brief sections.
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JavaScript classes - javascript.info
Very nice, brief, description of ECMA6 classes.
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CSS Reference - w3schools
Brief, quick, with interactive examples.
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CSS Tutorial - MDN
A long, but excellent discussion of Cascading Style Sheets for styling text, boxes, and
controlling layout.