如何在HTML中渲染含尖括号的表达式？现有代码渲染异常原因

Hey there! Let's break down why your expression isn't showing up as expected and walk through how to fix it.

The Root Cause #

In HTML, angle brackets < and > are reserved special characters—they’re used to define HTML tags (like <b> for bold text, <p> for paragraphs, etc.). When you write <B inside your <code> or <pre> blocks, the browser doesn’t treat it as plain text; it tries to parse it as an opening HTML tag. That’s why parts of your expression are missing or being formatted oddly (for example, <B gets interpreted as a bold tag, so the following text might appear bold until the browser hits a closing </B>—which doesn’t exist in your code, leading to unexpected rendering).

Even though <code> and <pre> are designed to display preformatted text/code with preserved spacing, they don’t automatically escape HTML special characters. The browser still parses any valid-looking HTML tags inside them.

How to Fix It #

You need to escape the special characters so the browser treats them as plain text. Replace:

• < with < (the HTML entity for "less than")
• > with > (the HTML entity for "greater than")

Here’s your corrected code:

<!DOCTYPE html>
<html>
<head>
</head>
<body>
<code> X = &lt;B, C, D, C, A, B, C&gt; and Y = &lt;C, A, D, B, C, B&gt; </code>
<pre> X = &lt;B, C, D, C, A, B, C&gt; and Y = &lt;C, A, D, B, C, B&gt; </pre>
</body>
</html>

Bonus: Quick Workaround for Large Blocks #

If you’re working with lots of text that has HTML special characters, you can use a <textarea> element (set to readonly to prevent editing) as a quick workaround—it automatically treats all content inside as plain text:

<textarea readonly rows="1" style="border: none; background: transparent; font-family: monospace;">
X = <B, C, D, C, A, B, C> and Y = <C, A, D, B, C, B>
</textarea>

That said, using HTML entities is the standard, recommended approach for most cases.

内容的提问来源于stack exchange，提问作者Venkat