safe.CSS

safe.CSS INPUT

template.CSS

safeCSS

Introduction

Hugo uses Go’s text/template and html/template packages.

The text/template package implements data-driven templates for generating textual output, while the html/template package implements data-driven templates for generating HTML output safe against code injection.

By default, Hugo uses the html/template package when rendering HTML files.

To generate HTML output that is safe against code injection, the html/template package escapes strings in certain contexts.

Usage

Use the safe.CSS function to encapsulate known safe content that matches any of:

1. The CSS3 stylesheet production, such as p { color: purple }.
2. The CSS3 rule production, such as a[href=~"https:"].foo#bar.
3. CSS3 declaration productions, such as color: red; margin: 2px.
4. The CSS3 value production, such as rgba(0, 0, 255, 127).

Use of this type presents a security risk: the encapsulated content should come from a trusted source, as it will be included verbatim in the template output.

See the Go documentation for details.

Example

Without a safe declaration:

{{ $style := "color: red;" }}
<p style="{{ $style }}">foo</p>

Hugo renders the above to:

<p style="ZgotmplZ">foo</p>

To declare the string as safe:

{{ $style := "color: red;" }}
<p style="{{ $style | safeCSS }}">foo</p>

Hugo renders the above to:

<p style="color: red;">foo</p>