The text uses combining characters, also known as combining marks. See section 2.11 of Combining Characters in the Unicode Standard (PDF).

In Unicode, character rendering does not use a simple character cell model where each glyph fits into a box with given height. Combining marks may be rendered above, below, or inside a base character

So you can easily construct a character sequence, consisting of a base character and “combining above” marks, of any length, to reach any desired visual height, assuming that the rendering software conforms to the Unicode rendering model. Such a sequence has no meaning of course, and even a monkey could produce it (e.g., given a keyboard with suitable driver).

And you can mix “combining above” and “combining below” marks.

The sample text in the question starts with:

• 拉丁大写字母h -H
• COMBINING拉丁小字母T -ͭ
• 结合希腊克朗尼 -̓
• 结合以上逗号 -̓
• 以上结合点 -̇

Zalgo文本之所以有效，是因为结合了字符。这些是特殊字符，允许修改之前出现的字符。

要么

y +̆=y̆实际上是

y + ̆ = y̆

由于您可以将它们一个接一个地堆叠，因此可以产生以下内容：

̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆

实际上是：

y̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆

将东西放在下面也是如此：

̰̰̰̰̰̰̰̰̰̰̰̰̰̰̰̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆

实际上是：

y̰̰̰̰̰̰̰̰̰̰̰̰̰̰̰̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆̆

在Unicode中，将欧洲语言的变音符号和国际音标结合起来的主要步骤是U + 0300–U + 036F。

在这里了解更多

要产生一个组合变音标记的列表，您可以使用以下脚本（因为链接不断消失）

for(var i=768; i<879; i++){console.log(new DOMParser().parseFromString("&#"+i+";", "text/html").documentElement.textContent +"  "+"&#"+i+";");}

还检查他们

Mͣͭͣ̾Vͣͥͭ͛ͤͮͥͨͥͧ̾