Notes on software and the ideas behind it

Find the meaning
behind the code.

I’m Fred Yang. I write about software—how it works, why it behaves the way it does, and the ideas that make code easier to reason about.

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Working notes / 2026

Recently mapped

Architecture, reactivity, and the hidden relationships that shape frontend systems.

javascript

Javascript reference syntax

The following reference is valid for all browsers.
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css

A well structured table

Before we can style an element, we you should have a well structured element. In this this case, table is the element. The more semantic your element is , the more control you have...
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css

fluid layout with fixed margin.

The following is fixed width layout.
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css

A wrapper with fixed margin and expandable width

The following is fixed width layout.
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css

pure css tool tip

Custom tootip can be achieved by using css, but it require firefox and ie7 up to support. Below is demo
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