word-break 和overflow-wrap（原word-wrap）在處理長單詞或不可斷行內(nèi)容時作用不同。 1. word-break 控制塊元素內(nèi)單詞如何斷行，break-all 強制斷開長詞，keep-all 避免斷開，適用於中日韓文本。 2. overflow-wrap 在必要時斷開長詞以防止溢出，break-word 更智能判斷上下文。 3. 使用場景上，code 用word-break: break-all，用戶評論用overflow-wrap: break-word。 4. 注意瀏覽器兼容性差異及移動端行為不同，建議結(jié)合white-space 或hyphens 提升可讀性。

When dealing with text layout in CSS, especially for long words or unbreakable content, word-break and word-wrap (now officially known as overflow-wrap ) are two properties that help control how text breaks within a container. They might seem similar at first glance, but they work a bit differently and are used in different scenarios.

What word-break Does

The word-break property controls how words break inside a block element when they reach the edge of the container.

• normal – Uses the default behavior (breaks at allowed spaces).
• break-all – Allows breaking within words if needed to prevent overflow — useful for strings like URLs or code snippets.
• keep-all – Prevents breaking within words, often used for Chinese, Japanese, or Korean text where word boundaries aren't clear.

For example, if you have a long string like verylongwordwithoutspaces , setting word-break: break-all will force it to wrap into multiple lines even in the middle of the word.

This is especially handy when displaying user-generated content that may contain very long strings — without it, those strings could break your layout.

How word-wrap (or overflow-wrap ) Works

Despite its name, word-wrap isn't really about wrapping words in general — it's more about handling overflow caused by long unbreakable words.

It has two main values:

• normal – Only breaks at normal word break points.
• break-word – Allows breaking within a word to prevent overflow (similar to word-break: break-all , but a bit more context-aware).

You'll often see this used on elements like comments or chat bubbles, where users might type or paste something like an API key or a long email address that would otherwise cause layout issues.

Note: word-wrap is now officially called overflow-wrap , though both names still work.

When to Use Which?

Choosing between them depends on what kind of content you're dealing with and how strict your layout needs are.

• Use word-break: break-all if you want to aggressively break any long word regardless of language or context.
• Use overflow-wrap: break-word if you want to be slightly more careful — it tries to keep whole words intact unless absolutely necessary.

Also consider combining them with white-space or using hyphens for better readability in some cases.

Here's a quick reference:

• For code blocks or logs → word-break: break-all
• For user comments or chats → overflow-wrap: break-word
• For better hyphenation (where supported) → add hyphens: auto

A Few Things to Watch Out For

These properties don't always behave the same across all browsers, especially older ones.

• In some versions of Edge or Safari, word-break might not work exactly like Chrome.
• Hyphenation ( hyphens ) works well in modern browsers but doesn't apply to all languages by default.
• Mobile browsers sometimes handle word wrapping differently due to screen size and zooming behaviors.

If you're building a responsive site or app, test your text-breaking styles on different devices and viewport sizes to make sure nothing overflows unexpectedly.

基本上就這些。

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