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.

field note

sys.application

If you enabled the Microsoft Ajax Library, a new lifecycle starts on the client side. As soon as the browser loads the main script file, MicrosoftAjax.js, the client runtime creates a global JavaScript object—the...
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asp.net ajax

javascript delegate callback

In c#, you can create a delegate like the code below.
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css

Inline box

Inline boxes are laid out in a line horizontally. The horizontal spacing can be adjusted using horizontal padding, borders, and margines. Howerver, vertical padding, borders, and margines will have no effect on the height...
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css

style, currentStyle, runtimeStyle

<p>style reprensent the style attribute of an object. But think of it as javascript object. If an element has no style attribute defined, element.color will be undefined. currentStyle is IE object that attached to...
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javascript

A CUSTOM TOOPTIPS

<pre data-sub="prettyprint:_"> function showTip(oEvent) { var oDiv = document.getElementById(“divTip1”); oDiv.style.visibility = “visible”; oDiv.style.left = oEvent.clientX + 5; oDiv.style.top = oEvent.clientY + 5; } </pre>
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