Developer reference

Header

Simple top row with brand identity and a view-in-browser link for reliable email starts.

Headers blockProduction documentation pageSource file: header.mjmlCopyable MJML and compiled HTML

Tags: header · brand · utility · view-in-browser

Rendering screenshot

Header rendering screenshot

Preview frame reflects current component rendering and real spacing proportions for production email QA.

Live preview

Rendered component preview

This preview is rendered from compiled HTML output so you can inspect the actual email structure, not a static mock-up.

Rendered email preview

Client support

Compatibility

4 clients

Rendering support notes across major email clients.

Header compatibility matrix
ClientStatusNotes
Gmail (Web + Mobile)TestedTwo-column alignment and browser link remain stable.
Outlook Desktop (Windows)PartialLink alignment can shift by a few pixels in narrow desktop panes.
Apple Mail (macOS + iOS)TestedNo additional notes.
Yahoo MailTestedNo additional notes.

Used in layouts

Where this block appears in production layout systems

These layout pages include this component in context, with block order, message structure, and QA guidance alongside the rendered email.

Related blocks

Continue building

These components are closely related by category or usage pattern and are useful when assembling a full email flow.

Source code

Copy the code you need

The source and compiled HTML shown below map directly to the rendered preview above. This keeps preview, MJML, and HTML handoff output aligned.

Snippet assembly: place this block inside the same <mj-body> as your other snippets, then stack sections in send order.

MJML snippet

Component block only. Use this when assembling an email from multiple reusable sections inside a project that already includes the shared MJML classes.

<mj-wrapper padding="0" full-width="full-width" />
      <mj-section padding="28px 34px" />
      <mj-column padding="0" />
      <mj-image padding="0 0 14px 0" />
      <mj-text padding="0 0 12px 0" font-size="16px" line-height="28px" color="#1a1a1a" />
      <mj-button padding="0" font-size="16px" font-weight="700" border-radius="999px" inner-padding="14px 30px" />

      <mj-class name="h1" font-size="42px" line-height="46px" font-weight="800" />
      <mj-class name="h2" font-size="36px" line-height="40px" font-weight="800" />
      <mj-class name="h3" font-size="30px" line-height="34px" font-weight="800" />
      <mj-class name="h4" font-size="26px" line-height="30px" font-weight="800" />
      <mj-class name="h5" font-size="22px" line-height="26px" font-weight="800" />
      <mj-class name="h6" font-size="20px" line-height="24px" font-weight="800" />
      <mj-class name="h1-display" font-size="56px" line-height="60px" font-weight="800" />
      <mj-class name="body" font-family="'Inter', Arial, sans-serif" font-size="17px" line-height="28px" />
      <mj-class name="small" font-family="'Inter', Arial, sans-serif" font-size="14px" line-height="23px" />
      <mj-class name="label" font-family="'Inter', Arial, sans-serif" font-size="12px" font-weight="700" text-transform="uppercase" letter-spacing="0.12em" />
      <mj-class name="bold" font-weight="700" />
      <mj-class name="extrabold" font-weight="800" />
      <mj-class name="white" color="#ffffff" />
      <mj-class name="light" color="#94a3b8" />
      <mj-class name="medium" color="#4a5568" />
      <mj-class name="dark" color="#1a1a1a" />
      <mj-class name="text-primary" color="#1a1a1a" />
      <mj-class name="text-muted" color="#4a5568" />
      <mj-class name="thblue" color="#2f67ef" />
      <mj-class name="whitebg" background-color="#ffffff" />
      <mj-class name="superlightbg" background-color="#f8fafc" />
      <mj-class name="thbluebg" background-color="#2f67ef" />
      <mj-class name="blackbg" background-color="#0f172a" />
      <mj-class name="darkbg" background-color="#102447" />
      <mj-class name="rocketbluebg" background-color="#183b7a" />
      <mj-class name="e3bluebg" background-color="#183b7a" />
      <mj-class name="transbg" background-color="transparent" />
      <mj-class name="badge" font-family="'Inter', Arial, sans-serif" font-size="12px" line-height="16px" font-weight="700" letter-spacing="0.12em" text-transform="uppercase" />
      <mj-class name="button" font-weight="700" />
    </mj-attributes>
    <mj-style>
      .border-top-light { border-top: 1px solid rgba(26, 26, 26, 0.1) !important; }
      .border-bottom-light { border-bottom: 1px solid rgba(26, 26, 26, 0.1) !important; }
      .grayscale img { filter: grayscale(100%); }
    </mj-style>
    
    <mj-raw>
      <meta name="color-scheme" content="light dark" />
      <meta name="supported-color-schemes" content="light dark" />
      <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
      <link href="https://fonts.googleapis.com/css2?family=Manrope:wght@400;600;700;800&family=Inter:wght@400;500;600;700&display=swap" rel="stylesheet" />
    </mj-raw>
  </mj-head>
  <mj-body background-color="#f3f4f6">
<!-- #-START-# Header -->
<mj-wrapper mj-class="whitebg">
  <mj-section padding="25px 35px">
    <mj-column vertical-align="middle">
      <mj-text mj-class="h6 text-primary extrabold" align="left" padding-bottom="0">TemplateHedgehog weekly build brief</mj-text>
    </mj-column>
  </mj-section>
  <mj-section padding="0 35px 20px">
    <mj-column>
      <mj-text mj-class="small text-muted" align="left" padding-bottom="0">Prepared for product, lifecycle, and delivery teams shipping campaigns this week.</mj-text>
    </mj-column>
  </mj-section>
</mj-wrapper>
<!-- #-END-# Header -->

Compiled HTML snippet

Component-only compiled markup for block-level inspection and HTML assembly workflows.

<!-- #-START-# Header -->
      <table
         align="center" border="0" cellpadding="0" cellspacing="0" role="presentation" style="background:#ffffff;background-color:#ffffff;width:100%;"
      >
        <tbody>
          <tr>
            <td>
              
        
      <!--[if mso | IE]><table align="center" border="0" cellpadding="0" cellspacing="0" class="" role="presentation" style="width:640px;" width="640" bgcolor="#ffffff" ><tr><td style="line-height:0px;font-size:0px;mso-line-height-rule:exactly;"><![endif]-->
    
        
      <div  style="margin:0px auto;max-width:640px;">
        
        <table
           align="center" border="0" cellpadding="0" cellspacing="0" role="presentation" style="width:100%;"
        >
          <tbody>
            <tr>
              <td
                 style="direction:ltr;font-size:0px;padding:0;text-align:center;"
              >
                <!--[if mso | IE]><table role="presentation" border="0" cellpadding="0" cellspacing="0"><tr><td class="" width="640px" ><table align="center" border="0" cellpadding="0" cellspacing="0" class="" role="presentation" style="width:640px;" width="640" ><tr><td style="line-height:0px;font-size:0px;mso-line-height-rule:exactly;"><![endif]-->
    
      
      <div  style="margin:0px auto;max-width:640px;">
        
        <table
           align="center" border="0" cellpadding="0" cellspacing="0" role="presentation" style="width:100%;"
        >
          <tbody>
            <tr>
              <td
                 style="direction:ltr;font-size:0px;padding:25px 35px;text-align:center;"
              >
                <!--[if mso | IE]><table role="presentation" border="0" cellpadding="0" cellspacing="0"><tr><td class="" style="vertical-align:middle;width:570px;" ><![endif]-->
            
      <div
         class="mj-column-per-100 mj-outlook-group-fix" style="font-size:0px;text-align:left;direction:ltr;display:inline-block;vertical-align:middle;width:100%;"
      >
        
      <table
         border="0" cellpadding="0" cellspacing="0" role="presentation" width="100%"
      >
        <tbody>
          <tr>
            <td  style="vertical-align:middle;padding:0;">
              
      <table
         border="0" cellpadding="0" cellspacing="0" role="presentation" style="" width="100%"
      >
        <tbody>
          
              <tr>
                <td
                   align="left" style="font-size:0px;padding:0 0 12px 0;padding-bottom:0;word-break:break-word;"
                >
                  
      <div
         style="font-family:'Manrope', 'Inter', Arial, sans-serif;font-size:20px;font-weight:800;line-height:24px;text-align:left;color:#1a1a1a;"
      >TemplateHedgehog weekly build brief</div>
    
                </td>
              </tr>
            
        </tbody>
      </table>
    
            </td>
          </tr>
        </tbody>
      </table>
    
      </div>
    
          <!--[if mso | IE]></td></tr></table><![endif]-->
              </td>
            </tr>
          </tbody>
        </table>
        
      </div>
    
      
      <!--[if mso | IE]></td></tr></table></td></tr><tr><td class="" width="640px" ><table align="center" border="0" cellpadding="0" cellspacing="0" class="" role="presentation" style="width:640px;" width="640" ><tr><td style="line-height:0px;font-size:0px;mso-line-height-rule:exactly;"><![endif]-->
    
      
      <div  style="margin:0px auto;max-width:640px;">
        
        <table
           align="center" border="0" cellpadding="0" cellspacing="0" role="presentation" style="width:100%;"
        >
          <tbody>
            <tr>
              <td
                 style="direction:ltr;font-size:0px;padding:0 35px 20px;text-align:center;"
              >
                <!--[if mso | IE]><table role="presentation" border="0" cellpadding="0" cellspacing="0"><tr><td class="" style="vertical-align:top;width:570px;" ><![endif]-->
            
      <div
         class="mj-column-per-100 mj-outlook-group-fix" style="font-size:0px;text-align:left;direction:ltr;display:inline-block;vertical-align:top;width:100%;"
      >
        
      <table
         border="0" cellpadding="0" cellspacing="0" role="presentation" width="100%"
      >
        <tbody>
          <tr>
            <td  style="vertical-align:top;padding:0;">
              
      <table
         border="0" cellpadding="0" cellspacing="0" role="presentation" style="" width="100%"
      >
        <tbody>
          
              <tr>
                <td
                   align="left" style="font-size:0px;padding:0 0 12px 0;padding-bottom:0;word-break:break-word;"
                >
                  
      <div
         style="font-family:'Inter', Arial, sans-serif;font-size:14px;line-height:23px;text-align:left;color:#4a5568;"
      >Prepared for product, lifecycle, and delivery teams shipping campaigns this week.</div>
    
                </td>
              </tr>
            
        </tbody>
      </table>
    
            </td>
          </tr>
        </tbody>
      </table>
    
      </div>
    
          <!--[if mso | IE]></td></tr></table><![endif]-->
              </td>
            </tr>
          </tbody>
        </table>
        
      </div>
    
      
      <!--[if mso | IE]></td></tr></table></td></tr></table><![endif]-->
              </td>
            </tr>
          </tbody>
        </table>
        
      </div>
    
        
      <!--[if mso | IE]></td></tr></table><![endif]-->
    
      
            </td>
          </tr>
        </tbody>
      </table>
    <!-- #-END-# Header -->

Full library

Need the entire system available offline

Public component pages are there for reference and one-off use. Template Hedgehog Pro is for teams that want the full archive, local source files, compiled HTML, and a quicker implementation handoff.

Why teams upgrade

  • Stop collecting blocks one page at a time
  • Keep the full MJML and compiled HTML archive locally
  • Speed up implementation, review, and delivery across projects