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Why are HTML comments disappearing in my Go web application?

Patricia ArquetteOriginal: 2024-11-03 23:45:31397browse

Go: HTML Comments Mysteriously Vanished

In your Go web application, you've noticed that HTML comments are no longer rendered after updating to a newer Go version. This unexpected behavior seems to be interfering with KnockoutJS code that relies on containerless control flow syntax.

The Problem

The crux of the issue lies in the escaping mechanism employed by the html/template package. By default, comments are escaped and omitted during template execution.

The Solution: Template.HTML

To circumvent this problem, introduce the template.HTML type from the html/template package. Values of this type are not subject to escaping during template rendering.

Registering a Custom Function

To take advantage of template.HTML, register a custom function called safe() with your template. This function will convert a string argument into template.HTML, thereby preventing its escape.

Usage

Modify your HTML comments by calling the safe() function and passing the original comment string as an argument. For example:

{{safe "<-- Some HTML comment -->"}}

Implementation

<code class="go">func main() {
    t := template.Must(template.New("").Funcs(template.FuncMap{
        "safe": func(s string) template.HTML { return template.HTML(s) },
    }).Parse(src))
    t.Execute(os.Stdout, nil)
}

const src = `<html><body>
{{safe "<-- This is a comment -->"}}
<div>Some <b>HTML</b> content</div>
</body></html>`</code>

Output

<code class="html"><html><body>
<!-- This is a comment -->
<div>Some <b>HTML</b> content</div>
</body></html></code>

Considerations

Escape quotation marks in HTML comments to prevent syntax errors.
Avoid conditional HTML comments to ensure consistent escaping.

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