SoftMoon-WebWare’s MasterColorPicker package delivers five JavaScript™ powered professional quality interactive graphical color-pickers, an EyeDropper color-picker, plus a named-color-table based color-picker framework with nine named-color database files included: named-color database files included: ANSI, Brewer, CorelD, Crayola, CSS, Material Design, OpenOffice, universal, & X11, plus (!) a “Pantone® colors” database file generator that takes just a minute to use.  Your chosen colors can be returned in the most popular color-space models including hexadecimal-RGB, RGB, HSL, HSB/HSV, HCG, HWB, CMYK, Lab, LCh, Luv, LChᵤᵥ, HSLᵤᵥ, OKLab, OKLCh, OKHSV, OKHSL, OKHWB, OKHCG, or XYZ, or when using named-colors their names can also be returned.  The different graphical color-pickers each look at the different available color-spaces in a different way, giving you complete intuitive control over finding the exact color you want.  Best of all, you can work with one color-space graphically, while outputting the corresponding conversion value from another color-space.  The five interactive graphical color-pickers included are:

RainbowMaestro Harmonic Color Picker™

Specializes in color-harmony, shows light/dark tints/tones/shades (monochromatic) of a selected hue and its complement, triadic complements, split-complements, and analogous colors, all in one color-wheel. Includes a “websafe colors” setting;  Colorblind assistant shows protan, deutan, & tritan simulations of the palette and selected color.

Spectral Progressive Color Picker™

Shows the progression of colors in steps based on the RGB color-space.  Works with browsers as far back as Internet Exploder 6.

BeezEye Color Picker™

Classic color-wheel shows HSL, HSB-HSV, HCG, LCh, OKHSL, OKHSV, OKHCG, OKLCh, HSLᵤᵥ, LChᵤᵥ, and CMYK color-spaces (one at a time) with user-controlled Lightness/Brightness-Value/Gray/Black.

Simple² Color Picker™

Works with the HSL & HSB-HSV or OKHSL & OKHSV color-spaces (both at once) to bring you simple access to the tints/tones/shades of any color (hue) from the “pure” (fully chromatic) color to →black, →white, and →gray.

YinYang NíHóng Color Picker™

Another classic style, delivers all of the 11,777,216 colors your 24-bit monitor can show within two easy clicks using either the HSL, HSB-HSV, HCG, OKHSL, OKHSV or OKHCG color-spaces.

All these graphical color pickers, except for the YinYang NíHóng color picker, are designed to show colors in definite “steps” of progression, allowing you to easily work with gradients (see our Rainbow-Maker projects) and find “matching” colors from other hues/tints/tones/shades.  The number of steps, or variety of colors, is user-controllable in real-time, from just a few to “high resolution”.  ¡Plus! MasterColorPicker brings you these additional features:

The MyPalette interface

allows users to build their own color-table-palettes, give each color a descriptive name, organize them to their liking, group them into sub-palettes, and save/retrieve them for future use or export them to CSS & GIMP palette files, allowing complete and simple management of all colors used throughout an entire project.  ¡Plus! the colorblind-assistant included within helps you select colors for your project that work for everyone.

The Color-Space Lab

gives you direct control of, and displays a color’s definitive values in the RGB, HSL, HSV/HSB, HCG, HWB, OKHSL, OKHSV/OKHSB, OKHCG, OKHWB, & CMYK color-spaces.  It also allows you to add an Alpha (opacity) value to your selected color, automatically if you choose.  The selected color’s Luminance is shown, as well as optionally the contrast with a specific previously selected color.  It can update automatically as you hover over a color in a palette; or you can use it to manually make color-space conversions.

The Color Thesaurus

shows you the nearest “named color” in any one of the named-color-table-palettes that you choose.

The Gradientor

gives you measured color-stops in a gradient, so you can change the opacity at regular intervals when building complex translucent background or fill gradients; or to style individual elements (perhaps each element in a list, headlines, whatever) for a decorative gradient transitional effect.  Or use it in “high-resolution” for fine-art, or whatever!

…

And much more… … …

Now these ain’t your grandpa’s color pickers, mind you.  The MasterColorPicker project relies on a modern computer with a modern browser.  Browsers used must embrace “modern” standards in the year 2022.  Also, MasterColorPicker was designed as a professional’s tool, not a toy to be used on an ity-bity laptop, or other portable device with a small monitor.  While most of MasterColorPicker’s panels adjust to the monitor height, the Color-Space Lab is (for now at least) a fixed size, and can be trouble to drag and move on a smaller browser window.  A wide screen is also preferable when multiple panels are open at once.  But some smaller monitors may still be manageable.

file:// vs. http://

MasterColorPicker automatically adapts to the environment that it is used in.  It can be placed in a folder on your personal computer and loaded into a browser using the file:// protocol (you click on the file in your filesystem for example); or it can be placed on a server and loaded into a browser using the http:// or https:// protocol.  The server may be remote, public or private (in “the cloud” or in a private network); or be a localhost/ on your personal computer.  Both protocols offer similar functionality, but server-based usage is much more convenient if you plan on adding or deleting named-color database tables on a regular basis.  With server-based (http:// or https:// protocol) usage, you simply create the named-color database file and add it to the proper folder; that’s it.  Or you can use the MyPalette interface to create your named-color-table and save your file to the server, and not even worry about which folders where … or about the file formatting details … MasterColorPicker takes care of it all for you and even lets you auto-load them in the future.  When you are done with your Palette file, simply use the PaletteManager to remove it, or manually remove it from the server’s folder.  With file:// protocol usage, you must manually add and remove HTML links to each of the named-color tables if you want them to auto-load when MasterColorPicker starts.  You can find info on doing such in MasterColorPicker’s ☺Help☺ panel while it is up-and-running. Both file:// and http:// (& https://) protocol usages allow you to easily save & load MyPalette and other named-color-table-palette files to & from your computer’s local filesystem, or the borwser’s private storage database, so without a server you are not high-and-dry; the advantage of server usage is the simplified auto-load feature, and having a centralized project host center for multiple developers. 

You will find these two (2) files in the root folder that are tools for digital media developers to find the colors of their dream’s desire: MasterColorPicker_desktop.html and MasterColorPicker_desktop.php
With the .html file, no server is needed; just click on the file and it will open in your browser.  With the .php file you of course need a server with PHP installed, and the same desktop tool is available, but it is an example of how you can incorporate MasterColorPicker into your own web page, and also of the subtle differences in the CSS and how the palette files are loaded (no HTML <script> tags needed to load them).  ¡Note both files support being used with a server!  There are two simple, primary differences between the files:  First, the .html file adds hard-coded links to the named-color-table files; (¡note both files recognize the environment they are active in, and if served from a server (via http:// or https://) the .html file will still allow you save & load palette files to/from the server-host!)  Second, the .html file adds a copy of some of the CSS styling directly into the HTML markup, which is needed for MasterColorPicker to work, since, for security reasons, browsers prevent a web page from reading any other files loaded from the local file system, including its own CSS stylesheet file (unless the user selects them by hand).

The named-colors database files themselves need to be adapted to the protocol they are used in.  With server based (http:// or https:// protocol) usage, these files are JSON formatted, and loaded using JavaScript™ to make HTTP calls back to the server (think ajax); whereas with file:// protocol usage, they are themselves JavaScript™ files loaded with an HTML <script src='colors-filename.palette.js'> tag.  Without a server, the palette files’ links need to be hard-coded into the web page.  However when using a server, it can tell MasterColorPicker what files are available, and MasterColorPicker can then load what it wants.  Look at the difference in the two MasterColorPicker_desktop files for an example of this principle.  See also the file color_palettes/index.php and note that it is a relatively simple file that can be replaced with one in another programming language (Node.js, Perl, etc.); using a server with MasterColorPicker is not limited to one with PHP installed.  Except for the “demo” MasterColorPicker_desktop.php file, the palette index file is the only active file on the server (except for some “utility files” that are not technically part of the project and are not required), and even it can be replaced with a simple .txt file.

Named-color tables

Because the named-color database tables are required to be in only slightly different formats, and many of the files are very long, these database files only come packaged in one format: for file:// protocol usage (extension .js).  There is an included PHP powered converter which will convert all the files to the server (http:// or https:// protocol) usage format (extension .json).  There is also an instruction file which explains the details on how to do this using the included converter, and also how to do this by hand (which is remarkably simple) if you don't have PHP installed.  These two files, convert_palette_formats.php and converting_palette_formats.odt,  can be found in the color_palettes/ folder.

Pantone® named-colors support can be easily included using the color_palettes/convertPantone.html file.  Boot up this .html file in your favorite browser and follow its directions.  The raw data is not included with this package, but can be found on GitHub: pantone-numbers.json

Building your own named-color-tables by hand is simple to do using any basic text-editor.  If you have a list/database of colors, they can easily be incorporated into MasterColorPicker.  Complete instructions on how to do this can be found in the README.odt file in the color_palettes folder.  However, MasterColorPicker’s MyPalette interface makes creating them from scratch a snap!

Using MasterColorPicker in your own project

It’s very easy to incorporate MasterColorPicker into your own project.  To limit download size, but maximize ease of use, the MasterColorPicker package comes with only the _desktop “tool” file.  Simply “cut out” the proper section of HTML from the MasterColorPicker_desktop.html file (the file is commented so you can tell what to cut), and either make it a new file: color-pickers/SoftMoon-WebWare/MasterColorPicker.htm that you can load into your webpage, for example using <?php include "color-pickers/SoftMoon-WebWare/MasterColorPicker.htm"; ?> in your web-page document at the appropriate place;  or simply paste the MasterColorPicker HTML you cut-out into your own web-page file; either way you then incorporate the MaterColorPicker HTML at whatever place in your document you desire.

Take a look at the “demo” MasterColorPicker_desktop.php file and note that it “includes” the color-pickers/SoftMoon-WebWare/MasterColorPicker.htm file, and how the required JavaScript™ and CSS files are loaded.  Note that if you want your webpage to be loadable from the local filesystem using the file:// protocol (you click on the file in your filesystem for example), you must also include links to the named-color-table palette files (see the MasterColorPicker_desktop.html file for that example).  To actually make the “demo” MasterColorPicker_desktop.php file function as the MasterColorPicker tool, you will need to “cut-out” the proper section of HTML from the MasterColorPicker_desktop.html file as described above, just as you would for your own web-page.  This is to avoid duplication in the package to limit download size.

Link the main MasterColorPicker.css file in the head of your document if you plan on using it.  Note how if you want your web-page to be able to be loaded in a browser with the URL using the file:// protocol (you click on the file in your filesystem for example), you must include a <style id='MasterColorPicker_desktop_stylesheet'> tag directly in the HTML page (¡not linked!) that includes the well-documented snippet of CSS found at the end of the similar <style> tag in the <head> of the MasterColorPicker_desktop.html file.  This is because the stylesheet must be modified directly in real-time by JavaScript, and browsers block JavaScript from reading files linked or loaded from the local file-system unless the end-user specifically selects that file by hand.

Your HTML (web page) file must be encoded in UTF-8.  You should already be using this encoding in all your web page files anyway.  JavaScript™ is required to be encoded in UTF-8, and this project uses a character set beyond the standard ASCII characters.  Remember, UTF-8 is the #1 international choice for character encoding.

Using the Picker interface

MasterColorPicker is built on an instance of SoftMoon-WebWare’s Picker interface, which creates a new input “type:” picker.  Using this interface is easy.  The most simple way to use this project is to place anywhere within your document any number of <input type='MasterColorPicker' /> tags and/or <input type='text' picker-type='MasterColorPicker' /> tags.  The MasterColorPicker will find them when the document is fully loaded and automatically “register them,” i.e. add the necessary event-handlers to interface with the Picker.  Using <input type='color' picker-type='MasterColorPicker' /> tags can work with the MasterColorPicker also, and with browsers that already support this natively, you will get the native color-picker plus the MasterColorPicker;  but caution:  the W3C specs say that <input type='color' /> should limit the user’s input to basic ways of defining colors, which means that your MasterColorPicker implementation should limit its output to hexadecimal RGB with a leading # symbol.

If you don’t like non-standard tag attributes, or you otherwise want to link an input tag to the MasterColorPicker, after the MasterColorPicker.js file is loaded, you can use JavaScript™ to link the input tag something like this:

A registered target element activates the Picker when the user clicks on it, or it otherwise receives “focus”. 

Using the “color swatches”

When a color is clicked on, the target element’s value is changed to the color-value-text.  Also, the associated “color swatch” has its background-color changed to the user-selected color, while its foreground-color becomes either black or white, opposing the background-color’s brightness.  The “color swatch” is either the target element itself when MasterColorPicker.showColorAs='background', or when MasterColorPicker.showColorAs='swatch' the color swatch is determined by the first valid condition in this list:

1. If the target is as such: <input swatch='myDocumentId' /> then the swatch is a document element with an id that matches “myDocumentId” if it exists.
2. If the target-object has a JavaScript™ property “swatch,” then the swatch is that property’s value.
3. If the JavaScript™ Object property MasterColorPicker.swatch is set, then the swatch is that property’s value.
4. The document Element that follows the target-input.

Be sure to read the end of the file MasterColorPicker.js for more details on using the “color swatch”.

Targets other than text <input>s.

You don’t need to use an <input type='text'> with MasterColorPicker.  <textarea>s, <select>s, <input type='text' list='datalistID' />s, and even document text-nodes are automatically recognized by the MasterColorPicker.pick() method.  By default, the JavaScript™ value of MasterColorPicker.dataTarget.value is set when a color is picked.  If no dataTarget is set then the MasterColorPicker.masterTarget is used, if any.  With text-nodes, the text is changed to the selected color.  However, for drag-&-drop functionality (and the “sizzors” in the EyeDropper) to work flawlessly, the dataTarget (and masterTarget) should be any DOM Element that can receive keyboard focus; this eliminates the possibility of using text-nodes as data-targets if the end-user drags and tries to drop an item off the browser window; setting MasterColorPicker.enablePanelDrag=false can help somewhat, but doesn’t completely solve the problem.  If it doesn’t naturally activate keyboard focus (like an <input> does) your JavaScript code should activate its focus in some way that you determine; and correspondingly, it should have a tabindex="-1" attribute.  Without keyboard focus on your target, if your end-user tries to drag something off the page and drop it there it will causes an error in functionality.  Having keyboard focus is also required if you want the MasterColorPicker to “pop-up” & “pop-down” or otherwise change display-state (in the code this is the MasterColorPicker.activeInterfaceState flag) though changing class-names on the “panels” (.activeInterface).  To supplement the default functionality of picking a color, add a JavaScript™ function to the Array of MasterColorPicker.pickFilters.  To replace this functionality, replace the MasterColorPicker.pick() method with your own function.  See the file JS_toolbox/SoftMoon-WebWare/Picker.js for more details.

MasterColorPicker’s™ file system structure.

The MasterColorPicker™ JavaScript™ code-base does not rely on any particular file-system structure or filenames, ¡except! for the color_palettes/ folder and its index.… file when using http:// or https:// protocol to load your web-page (i.e. it is loaded from a server).  As noted above, the included index.php file may be replaced by another index.… file in another programming language or even a simple text file, but it must be named “index” for the server to automatically find it.  The color_palettes/ folder may be renamed if need be; however, you must then modify the value SoftMoon.colorPalettes_defaultPath either directly (¡before the color-palettes load!) or by modifying the file JS_toolbucket/SoftMoon-WebWare/RGB_Calc.js (at the file’s beginning).  The color_palettes/html-indexer.php file is optional, but its name also must remain unchanged.  It will allow end-users the ability to get an HTML-based index with hyperlinks of the color_palettes/ folder and its sub-folders by simply typing something like: https://mywebsite.com/color_palettes/?html in their browser’s address bar.  Then the included color_palettes/index.php file (which the server will automatically use when no filename is specified in the folder) will call the color_palettes/html-indexer.php file instead of generating a simple flat text-based index.  If you have sub-folders in your color_palettes/ folder, you can then copy the html-indexer.php file into those sub-folders, but then rename it index.php in those sub-folders so the server will automatically use it.  Don’t copy the included color_palettes/index.php file into sub-folders; it is not needed.

Other folders and filenames may be changed or moved to suit your filesystem arrangement and organization.  You simply need to modify the <script> tags that actually load the files to match your new file-paths.  ¡The order the <script> files load is important!  You can defer them for faster page rendering.  As of 2022, the hard-coded <script> tag that defines the SoftMoon.WebWare & SoftMoon.loaded_palettes namespace properties should always go before any other MasterColorPicker™ files or Palette files.

Developers should note that the files in the folder +++JS/ modify standard JavaScript™ Objects and/or their prototypes.  That is why they have been given their own folder — to make it easier to keep track of in case of conflicts.

Structuring your own HTML and CSS

The first releases of MasterColorPicker focused on separating the JavaScript from the HTML and CSS as much as possible.  As the project evolved and bells and whistles were added, these three aspects of the project became more and more intertwined.  Modifying any aspect of the project will require careful testing.  In particular, the MyPalette interface is pretty tight.  The end of the MasterColorPicker.js file in particular relies on the standard HTML & CSS files.  Below you will find info on modifying older aspects of the project:

The visual presentation of the individual color-pickers is up to you.  There are a few comments within the supplied HTML/PHP files which will not be repeated here; you should read them.  One general consideration concerns the <canvas> tag widths & heights;  you may modify them, keeping in mind that the color-pickers build their palettes based on the given width of the <canvas>, so it is best to keep the width/height of the canvases equal (excepting some of the canvases in the Simple² & YinYang NíHóng pickers).  The important requirements to follow are listed below for each of the color-pickers in the MasterColorPicker project:

• RainbowMaestro Harmonic Color Picker™

  HTML requirements:

  • There must be a “wrapper” tag with an id='RainbowMaestro' containing:
    • 4 <canvas> tags
    • all the corresponding <input /> tags found in the supplied files.
    • 4 tags with class='subpalette_swatch'.  They will show the color of the hovered-over color for each individual <canvas>. 
  • Each <canvas> tag must be wrapped in its own “wrapper” tag.
  • The <input /> tags in your file must have the same names, types, & values found in the supplied files.
  • There should be a tag with id='RainbowMaestro_indicator'.  It will show the text-output for the hovered-over color.  It should have text in it by default, if only a blank space, with no other tags, at the beginning.
  • There should be a “wrapper” tag with id='RainbowMaestro_hueIndicator'.  The last tag within this wrapper will show the hovered-over hue as a value in degrees. 
  • There should be a tag with id='RainbowMaestro_swatch'.  It will show the color-output for the hovered-over color that matches the text-output. 

  CSS requirements:

  none.

• Spectral Progressive Color Picker™

  HTML requirements:

  Do not alter the HTML for this picker.

  CSS requirements:

  none.

• BeezEye Color Picker™

  HTML requirements:

  • There must be a “wrapper” tag with an id='BeezEye' containing:
    • A <canvas> tag
    • all the corresponding <input /> tags found in the supplied files.
  • The <input /> tags in your file must have the same names, types, & values found in the supplied files.
  • There should be a tag with id='BeezEye_indicator'.  It will show the text-output for the hovered-over color.  It should have text in it by default, if only a blank space, with no other tags, at the beginning.
  • There should be a tag with id='BeezEye_swatch'.  It will show the color-output for the hovered-over color that matches the text-output. 

  CSS requirements:

  none.

• Simple² Color Picker™

  HTML requirements:

  • Your file must be encoded in UTF-8.
  • There must be a “wrapper” tag with an id='Simple²' containing:
    • 5 <canvas> tags
    • all the corresponding <input /> tags found in the supplied files.
  • The <input /> tags in your file must have the same names, types, & values found in the supplied files.
  • Each <canvas> tag must be wrapped in its own “wrapper” tag, and each wrapper tag must have an id corresponding/matching the ones wrapping the canvas tags in the supplied files;  be sure to use the proper combinations of caps/lowercase.  Note some canvases are filled vertically, others horizontally, so set their height/width appropriately.
  • There should be a tag with id='Simple²hue'.  It will show the hue in degrees for the displayed colors.  It should have text in it by default, if only a blank space, with no other tags, at the beginning.
  • There should be a tag with id='Simple²saturation'.  It will show the saturation level for the displayed colors.  It should have text in it by default, if only a blank space, with no other tags, at the beginning.
  • There should be a tag with id='Simple²lvl'.  It will show the Brightness/Value/Lightness level for the displayed colors.  It should have text in it by default, if only a blank space, with no other tags, at the beginning.
  • There should be a tag with id='Simple²_indicator'.  It will show the text-output for the hovered-over color.  It should have text in it by default, if only a blank space, with no other tags, at the beginning.
  • There should be a tag with id='Simple²_swatch'.  It will show the color-output for the hovered-over color that matches the text-output. 

  CSS requirements:

  none.

• YinYang NíHóng Color Picker™

  HTML requirements:

  • Your file must be encoded in UTF-8.
  • There must be a “wrapper” tag with an id='YinYangNíHóng' containing:
    • 3 <canvas> tags
    • all the corresponding <input /> tags found in the supplied files.
  • The <input /> tags in your file must have the same names, types, & values found in the supplied files.
  • The first <canvas> tag is the background with the rainbow-ring and main section of the Yin-Yang.  The second <canvas> tag is the “hue swatches” (the animated disks of the Yin-Yang).  The third <canvas> tag is the monochromatic gradient (the central part of the color-picker).  For best results, if you modify the width/height of these canvases, keep them proportional in size to what is given in the supplied files.  Also pay heed to the CSS positioning of these canvases, one over the other. 
  • There should be a tag with id='YinYangNíHóng_indicator'.  It will show the text-output for the hovered-over color.  It should have text in it by default, if only a blank space, with no other tags, at the beginning.
  • There should be a tag with id='YinYangNíHóng_swatch'.  It will show the color-output for the hovered-over color that matches the text-output. 

  CSS requirements:

  • Pay heed to the CSS positioning of the 3 canvases, one over the other, based on their size.

When the user clicks on a registered target element or it otherwise receives “focus,” the MasterColorPicker is activated.  When activated, the MasterColorPicker “main panel” and “options panel” (see the HTML), as well as the currently selected color-picker, all receive the class-name “activePicker”.  There are other class-names added to various HTML elements in the MasterColorPicker under other various conditions.  For more detailed info on what class-names are applied and when, please see the comments in the JS_toolbox/SoftMoon-WebWare/Picker.js file.  To modify these used class-names, modify the values of the JavaScript™ properties of MasterColorPicker.classnames.  By understanding when and why these class-names are applied, you can create your own CSS file to control the dynamic display of the MasterColorPicker.

Adding & removing color-pickers

You may add your own color-pickers to, or remove individual color-pickers from the MasterColorPicker framework.  To remove one or more of the included color-pickers, simply remove its HTML and JavaScript™ from the given files.  The sections are clearly deliminated with comments.  The x_ColorPicker JavaScript™ Class is universal to all color-pickers in the MasterColorPicker framework, and should remain.  Don’t forget to lighten the weight of the CSS file, but that is not a requirement. 

Adding your own (or someone else’s) color-picker is easy.  Its HTML should be included within the MasterColorPicker_mainPanel (see the supplied files), and its id should match the choice offered in the palette_select.  You should of course add this choice to the palette_select.  The palette_select choice may have spaces to match the “display name” of your added color-picker, and these will be removed when matching an id;  for example a choice of “YinYang NíHóng” corresponds to id “YinYangNíHóng”. 

To interface another color-picker with the MasterColorPicker framework is easy, but as powerful things go, this process has details that must be understood to fully utilize.  Most simply, when a color is selected, using JavaScript™, simply call MasterColorPicker.pick(……colorChoiceText……);  however this bypasses the central x_ColorPicker framework which can convert the choice to the user’s color-space preferences, and set the color of “color swatches”. 

Using the x_ColorPicker framework is a bit different, as it is “event” oriented.  Please read the comments in the MasterColorPicker.js file regarding the x_ColorPicker framework, but here are some basic additional notes.  The x_ColorPicker framework offers a handleMouse method for onmouseover, onmousemove, and onmouseout events, and a handleClick method for onclick events.  They require two arguments passed in, yet browsers only pass in the first by default: the event object.  So you must either use your own event handler which calls these x_ColorPicker methods, or, more conveniently, use the UniDOM framework that is included with this package to add these methods as event handlers.  Take a close look (in the MasterColorPicker.js file at the end of each color-picker’s section) at how the supplied color-pickers add their event handlers using the UniDOM framework, and how the args object is passed on to the x_ColorPicker methods by adding it as a final argument passed to UniDOM.addEventHandler(………). 

Building your own color-pickers

SoftMoon-WebWare’s Picker Class framework on which the MasterColorPicker is based is a powerful tool that creates an <input /> “type = picker”.  Your color-picker can be as complex as you need it to be, with multiple “interface panels,” interactive inputs that modify the picker and/or its choices, etc.  Please carefully read the JS_toolbox/SoftMoon-WebWare/Picker.js file and its comments about “registering” these interface panels and interface elements.  Registering them adds the necessary event handlers for them to work correctly with the MasterColorPicker framework.  Panels are registered using MasterColorPicker.registerInterfacePanel(……element……)  All HTML elements that require keyboard “focus” (such as <input type='text|file|number|etc.' /> <select> <textarea>) that are part of your picker but are not on a registered “interface panel” must be registered using MasterColorPicker.registerInterfaceElement(……element……)