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add lazy loading attribute to images

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This commit is contained in:
Bente Groh 2025-06-24 22:59:15 +02:00
parent 6d4554b01c
commit cfeda81e2a
2 changed files with 4 additions and 0 deletions
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1
modules/markup/markdown/transform_image.go
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@ -44,6 +44,7 @@ func (g *ASTTransformer) transformImage(ctx *markup.RenderContext, v *ast.Image)
for _, attr := range v.Attributes() {
image.SetAttribute(attr.Name, attr.Value)
}
image.SetAttributeString("loading", []byte("lazy"))
for child := v.FirstChild(); child != nil; {
next := child.NextSibling()
image.AppendChild(image, child)

3
modules/markup/sanitizer.go
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@ -108,6 +108,9 @@ func createDefaultPolicy() *bluemonday.Policy {
// Allow classes for emojis
policy.AllowAttrs("class").Matching(regexp.MustCompile(`^emoji$`)).OnElements("img")
// Allow attributes for images
policy.AllowAttrs("loading").Matching(regexp.MustCompile(`^lazy$`)).OnElements("img")
// Allow icons, emojis, chroma syntax and keyword markup on span
policy.AllowAttrs("class").Matching(regexp.MustCompile(`^((icon(\s+[\p{L}\p{N}_-]+)+)|(emoji)|(language-math display)|(language-math inline))$|^([a-z][a-z0-9]{0,2})$|^` + keywordClass + `$`)).OnElements("span")
policy.AllowAttrs("data-alias").Matching(regexp.MustCompile(`^[a-zA-Z0-9-_+]+$`)).OnElements("span")