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Squared Rectangle in Four Colors:
You Design It, and The Colors Come Automatically!

A  perfect  squared rectangle  is put together from squares of different sizes.
In order to create a squared rectangle yourself, you edit a
so-called graph. Coloring can be either instant or animated.
Get started,  or  Go ahead without user guide
JavaScript programming:  Graphics can be done directly in your browser without a graphics program.

Walter Zorn's Graphics Libraries – And Where to Find Them

The article below is mostly for experts in musical keyboard temperament.  Everybody else may look at some basic facts.

Bradley Lehman's Bach Temperament:  Some New and Old Insight

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Bradley Lehman’s Bach Temperament

was published in Early Music in February and May 2005.
The arguments sound convincing, and so does the music
when played on an instrument tuned in that temperament.
But were a few things overlooked in the debate that followed?

Vector Graphics Directly in HTML:
No Graphics Program Needed.

Looking for Walter Zorn’s jsgraphics version 3.05?
Or dragdrop version 4.91?   Or Tooltips  5.31, etc.?
They did not disappear. The manuals are there, too.
Be sure to use the official links to up-to-date versions.
There is also a little explanation and some examples.
JavaScript is a fascinating programming language.  But watch out !  Only very few tutorials warn against this reliability trap:

Wrong Result With an Array In a Prototype.

Executable example and a solution. The document accompanies a question and an answer at  CodingForums.
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