Markdown on Hugo Theme Stack

Markdown 语法指南

Sun, 25 Jan 2026 00:00:00 +0000

这篇文章提供了可以在 Hugo 内容文件中使用的基本 Markdown 语法示例，同时也展示了 Hugo 主题中基本 HTML 元素是否应用了 CSS 装饰。

标题 (Headings)

以下 HTML <h1>—<h6> 元素代表了六个级别的章节标题。<h1> 是最高级别，而 <h6> 是最低级别。

H3

H4

H5

H6

段落 (Paragraph)

Xerum, quo qui aut unt expliquam qui dolut labo. Aque venitatiusda cum, voluptionse latur sitiae dolessi aut parist aut dollo enim qui voluptate ma dolestendit peritin re plis aut quas inctum laceat est volestemque commosa as cus endigna tectur, offic to cor sequas etum rerum idem sintibus eiur? Quianimin porecus evelectur, cum que nis nust voloribus ratem aut omnimi, sitatur? Quiatem. Nam, omnis sum am facea corem alique molestrunt et eos evelece arcillit ut aut eos eos nus, sin conecerem erum fuga. Ri oditatquam, ad quibus unda veliamenimin cusam et facea ipsamus es exerum sitate dolores editium rerore eost, temped molorro ratiae volorro te reribus dolorer sperchicium faceata tiustia prat.

Itatur? Quiatae cullecum rem ent aut odis in re eossequodi nonsequ idebis ne sapicia is sinveli squiatum, core et que aut hariosam ex eat.

引用 (Blockquotes)

引用元素代表从另一个来源引用的内容，可以选择带有引用说明（必须在 footer 或 cite 元素内），也可以选择带有行内更改（如注释和缩写）。

不带出处的引用

Tiam, ad mint andaepu dandae nostion secatur sequo quae. 注意：你可以在引用中使用 Markdown 语法。

带有出处的引用

不要通过共享内存来通信，而要通过通信来共享内存。 — Rob Pike¹

带提示的引用

[!NOTE] 突出显示用户在快速浏览时也应注意的信息。

[!TIP] 可选信息，帮助用户更顺利地完成任务。

[!IMPORTANT] 用户成功所必需的关键信息。

[!WARNING] 由于潜在风险而需要用户立即关注的关键内容。

[!CAUTION] 某个操作可能带来的负面后果。

[!NOTE] 自定义标题如果你想使用自定义标题，可以在方括号后面添加标题文本，如上所示。

表格 (Tables)

表格虽然不是 Markdown 核心规范的一部分，但 Hugo 出箱即用地支持它们。

姓名	年龄
Bob	27
Alice	23

表格内的行内 Markdown

斜体	加粗	代码
italics	bold	`code`

A	B	C	D	E	F
Lorem ipsum dolor sit amet, consectetur adipiscing elit.	Phasellus ultricies, sapien non euismod aliquam, dui ligula tincidunt odio, at accumsan nulla sapien eget ex.	Proin eleifend dictum ipsum, non euismod ipsum pulvinar et. Vivamus sollicitudin, quam in pulvinar aliquam, metus elit pretium purus	Proin sit amet velit nec enim imperdiet vehicula.	Ut bibendum vestibulum quam, eu egestas turpis gravida nec	Sed scelerisque nec turpis vel viverra. Vivamus vitae pretium sapien

代码块 (Code Blocks)

使用反引号的代码块

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Example HTML5 Document</title>
</head>
<body>
  <p>Test</p>
</body>
</html>

使用四个空格缩进的代码块

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Example HTML5 Document</title>
</head>
<body>
  <p>Test</p>
</body>
</html>

Diff 代码块

[dependencies.bevy]
git = "https://github.com/bevyengine/bevy"
rev = "11f52b8c72fc3a568e8bb4a4cd1f3eb025ac2e13"
- features = ["dynamic"]
+ features = ["jpeg", "dynamic"]

单行代码块

<p>A paragraph</p>

列表类型 (List Types)

有序列表

第一项
第二项
第三项

无序列表

列表项
另一项
还有一项

嵌套列表

水果
- 苹果
- 橘子
- 香蕉
乳制品
- 牛奶
- 奶酪

其他元素 — abbr, sub, sup, kbd, mark

GIF 是一种位图图像格式。

H2O

Xn + Yn = Zn

按 CTRL + ALT + Delete 结束会话。

大多数蝾螈是夜行性的，捕食昆虫、蠕虫和其他小型生物。

以上引用摘自 Rob Pike 在 2015 年 11 月 18 日 Gopherfest 期间的演讲。 ↩︎

Mermaid Diagrams

Tue, 23 Dec 2025 00:00:00 +0000

This theme supports Mermaid diagrams directly in your Markdown content. Mermaid lets you create diagrams and visualizations using text and code.

About Mermaid.js

This theme integrates Mermaid.js (v11) to render diagrams from text definitions within Markdown code blocks. Mermaid is a JavaScript-based diagramming and charting tool that uses text-based syntax inspired by Markdown.

For complete syntax documentation, see the Mermaid.js documentation.

Getting Started

To create a Mermaid diagram, simply use a fenced code block with mermaid as the language identifier:

```mermaid
graph TD
    A[Start] --> B[Process]
    B --> C[End]
```

The diagram will be automatically rendered when the page loads.

Features

Auto-detection: Mermaid script only loads on pages that contain diagrams
Theme Support: Diagrams automatically adapt to light/dark mode
HTML Labels: Support for HTML content in labels (like <br/> for line breaks)
Configurable: Customize version, security level, and more in your site config

Configuration

You can configure Mermaid in your site config:

hugo.yaml:

params:
  article:
    mermaid:
      version: "11"           # Mermaid version from CDN
      look: classic           # classic or handDrawn (sketch style)
      lightTheme: default     # Theme for light mode
      darkTheme: neutral      # Theme for dark mode
      securityLevel: strict   # strict (default), loose, antiscript, sandbox
      htmlLabels: true        # Enable HTML in labels

hugo.toml:

[params.article.mermaid]
  version = "11"           # Mermaid version from CDN
  look = "classic"         # classic or handDrawn (sketch style)
  lightTheme = "default"   # Theme for light mode
  darkTheme = "neutral"    # Theme for dark mode
  securityLevel = "strict" # strict (default), loose, antiscript, sandbox
  htmlLabels = true        # Enable HTML in labels

Additional Global Options

These optional settings use Mermaid’s defaults when not specified:

hugo.yaml:

params:
  article:
    mermaid:
      maxTextSize: 50000      # Maximum text size (default: 50000)
      maxEdges: 500           # Maximum edges allowed (default: 500)
      fontSize: 16            # Global font size in pixels (default: 16)
      fontFamily: "arial"     # Global font family
      curve: "basis"          # Line curve: basis, cardinal, linear (default: basis)
      logLevel: 5             # Debug level 0-5, 0=debug, 5=fatal (default: 5)

hugo.toml:

[params.article.mermaid]
  maxTextSize = 50000      # Maximum text size (default: 50000)
  maxEdges = 500           # Maximum edges allowed (default: 500)
  fontSize = 16            # Global font size in pixels (default: 16)
  fontFamily = "arial"     # Global font family
  curve = "basis"          # Line curve: basis, cardinal, linear (default: basis)
  logLevel = 5             # Debug level 0-5, 0=debug, 5=fatal (default: 5)

For diagram-specific options (like flowchart.useMaxWidth), use Mermaid’s init directive directly in your diagram:

```mermaid
%%{init: {'flowchart': {'useMaxWidth': false}}}%%
flowchart LR
    A --> B
```

Security Note: The default securityLevel: strict is recommended. Set to loose only if you need HTML labels like <br/> in your diagrams.

Available Themes

Theme	Description
`default`	Standard colorful theme
`neutral`	Grayscale, great for printing and dark mode
`dark`	Designed for dark backgrounds
`forest`	Green color palette
`base`	Minimal theme, customizable with themeVariables
`null`	Disable theming entirely

Custom Theme Variables

For full control, use the base theme with custom variables:

hugo.yaml:

params:
  article:
    mermaid:
      lightTheme: base
      darkTheme: base
      lightThemeVariables:
        primaryColor: "#4a90d9"
        primaryTextColor: "#ffffff"
        lineColor: "#333333"
      darkThemeVariables:
        primaryColor: "#6ab0f3"
        primaryTextColor: "#ffffff"
        lineColor: "#cccccc"
        background: "#1a1a2e"

hugo.toml:

[params.article.mermaid]
  lightTheme = "base"
  darkTheme = "base"

  [params.article.mermaid.lightThemeVariables]
    primaryColor = "#4a90d9"
    primaryTextColor = "#ffffff"
    lineColor = "#333333"

  [params.article.mermaid.darkThemeVariables]
    primaryColor = "#6ab0f3"
    primaryTextColor = "#ffffff"
    lineColor = "#cccccc"
    background = "#1a1a2e"

Common variables: primaryColor, secondaryColor, tertiaryColor, primaryTextColor, lineColor, background, fontFamily

Note: Theme variables only work with the base theme and must use hex color values (e.g., #ff0000).

Diagram Types

Flowchart

Flowcharts are the most common diagram type. Use graph or flowchart with direction indicators:

TD or TB: Top to bottom
BT: Bottom to top
LR: Left to right
RL: Right to left

  flowchart LR
    A[Hard edge] -->|Link text| B(Round edge)
    B --> C{Decision}
    C -->|One| D[Result one]
    C -->|Two| E[Result two]

Sequence Diagram

Perfect for showing interactions between components:

  sequenceDiagram
    participant Alice
    participant Bob
    Alice->>John: Hello John, how are you?
    loop Healthcheck
        John->>John: Fight against hypochondria
    end
    Note right of John: Rational thoughts <br/>prevail!
    John-->>Alice: Great!
    John->>Bob: How about you?
    Bob-->>John: Jolly good!

Class Diagram

Visualize class structures and relationships:

  classDiagram
    Animal <|-- Duck
    Animal <|-- Fish
    Animal <|-- Zebra
    Animal : +int age
    Animal : +String gender
    Animal: +isMammal()
    Animal: +mate()
    class Duck{
        +String beakColor
        +swim()
        +quack()
    }
    class Fish{
        -int sizeInFeet
        -canEat()
    }
    class Zebra{
        +bool is_wild
        +run()
    }

State Diagram

Model state machines and transitions:

  stateDiagram-v2
    [*] --> Still
    Still --> [*]

    Still --> Moving
    Moving --> Still
    Moving --> Crash
    Crash --> [*]

Entity Relationship Diagram

Document database schemas:

  erDiagram
    CUSTOMER ||--o{ ORDER : places
    ORDER ||--|{ LINE-ITEM : contains
    CUSTOMER }|..|{ DELIVERY-ADDRESS : uses
    CUSTOMER {
        string name
        string custNumber
        string sector
    }
    ORDER {
        int orderNumber
        string deliveryAddress
    }

Gantt Chart

Plan and track project schedules:

  gantt
    title A Gantt Diagram
    dateFormat YYYY-MM-DD
    section Section
        A task          :a1, 2024-01-01, 30d
        Another task    :after a1, 20d
    section Another
        Task in Another :2024-01-12, 12d
        another task    :24d

Pie Chart

Display proportional data:

  pie showData
    title Key elements in Product X
    "Calcium" : 42.96
    "Potassium" : 50.05
    "Magnesium" : 10.01
    "Iron" :  5

Git Graph

Visualize Git branching strategies:

  gitGraph
    commit
    commit
    branch develop
    checkout develop
    commit
    commit
    checkout main
    merge develop
    commit
    commit

Mindmap

Create hierarchical mindmaps:

  mindmap
  root((mindmap))
    Origins
      Long history
      Popularisation
        British popular psychology author Tony Buzan
    Research
      On effectiveness<br/>and features
      On Automatic creation
        Uses
            Creative techniques
            Strategic planning
            Argument mapping
    Tools
      Pen and paper
      Mermaid

Timeline

Display chronological events:

  timeline
    title History of Social Media Platform
    2002 : LinkedIn
    2004 : Facebook
         : Google
    2005 : YouTube
    2006 : Twitter

Advanced Features

HTML in Labels

To use HTML in labels, you must set securityLevel: loose in your site config:

hugo.yaml:

params:
  article:
    mermaid:
      securityLevel: loose
      htmlLabels: true

hugo.toml:

[params.article.mermaid]
  securityLevel = "loose"
  htmlLabels = true

Then you can use HTML tags like <br/> for line breaks:

```mermaid
graph TD
    A[Line 1<br/>Line 2] --> B[<b>Bold</b> text]
```

Per-Diagram Theming

Override the theme for a specific diagram using Mermaid’s frontmatter:

```mermaid
%%{init: {'theme': 'forest'}}%%
graph TD
    A[Start] --> B[End]
```

  %%{init: {'theme': 'forest'}}%%
graph TD
    A[Christmas] -->|Get money| B(Go shopping)
    B --> C{Let me think}
    C -->|One| D[Laptop]
    C -->|Two| E[iPhone]
    C -->|Three| F[Car]

Inline Styling with `style`

You can style individual nodes directly within your diagram using the style directive:

```mermaid
flowchart LR
    A[Start] --> B[Process] --> C[End]
    style A fill:#4ade80,stroke:#166534,color:#000
    style B fill:#60a5fa,stroke:#1e40af,color:#000
    style C fill:#f87171,stroke:#991b1b,color:#fff
```

Result:

  flowchart LR
    A[Start] --> B[Process] --> C[End]
    style A fill:#4ade80,stroke:#166534,color:#000
    style B fill:#60a5fa,stroke:#1e40af,color:#000
    style C fill:#f87171,stroke:#991b1b,color:#fff

Style properties include:

fill - Background color
stroke - Border color
stroke-width - Border thickness
color - Text color
stroke-dasharray - Dashed border (e.g., 5 5)

Styling with CSS Classes

You can define reusable styles with classDef and apply them using :::className:

```mermaid
flowchart LR
    A:::success --> B:::info --> C:::warning
    classDef success fill:#4ade80,stroke:#166534,color:#000
    classDef info fill:#60a5fa,stroke:#1e40af,color:#000
    classDef warning fill:#fbbf24,stroke:#92400e,color:#000
```

Result:

  flowchart LR
    A:::success --> B:::info --> C:::warning
    classDef success fill:#4ade80,stroke:#166534,color:#000
    classDef info fill:#60a5fa,stroke:#1e40af,color:#000
    classDef warning fill:#fbbf24,stroke:#92400e,color:#000

Subgraphs

Group related nodes together:

  flowchart TB
    subgraph one
        a1-->a2
    end
    subgraph two
        b1-->b2
    end
    subgraph three
        c1-->c2
    end
    one --> two
    three --> two
    two --> c2

Theme Switching

This theme automatically detects your site’s light/dark mode preference and adjusts the Mermaid diagram theme accordingly:

Light mode: Uses the default Mermaid theme
Dark mode: Uses the dark Mermaid theme (configurable)

Try toggling the theme switcher to see diagrams update in real-time!

Complex Example

Here’s an example with subgraphs, HTML labels, emojis, and custom styling:

  flowchart TD
  subgraph client["👤 Client"]
      A["User Device<br/>192.168.1.10"]
  end

  subgraph cloud["☁️ Cloud Gateway"]
      B["Load Balancer<br/>(SSL Termination)"]
  end

  subgraph server["🖥️ Application Server"]
      C["API Gateway<br/>10.0.0.1"]
      D["Auth Service<br/>10.0.0.2"]
      E["Web Server<br/>10.0.0.3"]
      F["Database<br/>10.0.0.4"]
  end

  A -- "HTTPS Request" --> B
  B -- "Forward<br/>(internal)" --> C
  C -- "Authenticate" --> D
  D -- "Token" --> C
  C -- "Route" --> E
  E --> F

  style client fill:#1a365d,stroke:#2c5282,color:#fff
  style cloud fill:#f6ad55,stroke:#dd6b20,color:#000
  style server fill:#276749,stroke:#22543d,color:#fff

Note: This example requires securityLevel: loose for HTML labels and styling to work.

Known Limitations

Dark Mode Theming

Mermaid.js’s built-in themes have some limitations:

dark theme (default): Best text contrast, but some diagram backgrounds may appear brownish (e.g., Gantt charts)
neutral theme: Better background colors, but some text (labels, legends) may have reduced contrast

For full control, use the base theme with custom variables:

hugo.yaml:

params:
  article:
    mermaid:
      darkTheme: base
      darkThemeVariables:
        primaryColor: "#1f2937"
        primaryTextColor: "#ffffff"
        lineColor: "#9ca3af"
        textColor: "#e5e7eb"

hugo.toml:

[params.article.mermaid]
  darkTheme = "base"

  [params.article.mermaid.darkThemeVariables]
    primaryColor = "#1f2937"
    primaryTextColor = "#ffffff"
    lineColor = "#9ca3af"
    textColor = "#e5e7eb"

We plan to improve dark mode theming in future updates as Mermaid.js evolves.

Troubleshooting

Diagram not rendering?

Make sure you’re using a fenced code block with mermaid as the language
Check your browser’s console for syntax errors
Verify your Mermaid syntax at Mermaid Live Editor

HTML not working in labels?

HTML in labels requires securityLevel: loose. Update your configuration:

hugo.yaml:

params:
  article:
    mermaid:
      securityLevel: loose
      htmlLabels: true

hugo.toml:

[params.article.mermaid]
  securityLevel = "loose"
  htmlLabels = true

Warning: Using loose security level allows HTML in diagrams. Only use this if you trust your diagram content.

Syntax errors?

Mermaid is strict about syntax. Common issues:

Missing spaces around arrows
Unclosed brackets or quotes
Invalid node IDs (avoid special characters)

Resources

Mermaid Documentation
Mermaid Live Editor - Test diagrams interactively
Mermaid Syntax Reference

Markdown on Hugo Theme Stack

Markdown 语法指南

标题 (Headings)

H3

H4

H5

H6

段落 (Paragraph)

引用 (Blockquotes)

不带出处的引用

带有出处的引用

带提示的引用

表格 (Tables)

表格内的行内 Markdown

代码块 (Code Blocks)

使用反引号的代码块

使用四个空格缩进的代码块

Diff 代码块

单行代码块

列表类型 (List Types)

有序列表

无序列表

嵌套列表

其他元素 — abbr, sub, sup, kbd, mark

Mermaid Diagrams

About Mermaid.js

Getting Started

Features

Configuration

Additional Global Options

Available Themes

Custom Theme Variables

Diagram Types

Flowchart

Sequence Diagram

Class Diagram

State Diagram

Entity Relationship Diagram

Gantt Chart

Pie Chart

Git Graph

Mindmap

Timeline

Advanced Features

HTML in Labels

Per-Diagram Theming

Inline Styling with style

Styling with CSS Classes

Subgraphs

Theme Switching

Complex Example

Known Limitations

Dark Mode Theming

Troubleshooting

Diagram not rendering?

HTML not working in labels?

Syntax errors?

Resources

Inline Styling with `style`