Source: html.go in package github.com/yuin/goldmark/renderer/html

package html

import (
	"bytes"
	"fmt"
	"strconv"

	"github.com/yuin/goldmark/ast"
	"github.com/yuin/goldmark/renderer"
	"github.com/yuin/goldmark/util"
)

A Config struct has configurations for the HTML based renderers.

type Config struct {
	Writer    Writer
	HardWraps bool
	XHTML     bool
	Unsafe    bool
}

NewConfig returns a new Config with defaults.

func NewConfig() Config {
	return Config{
		Writer:    DefaultWriter,
		HardWraps: false,
		XHTML:     false,
		Unsafe:    false,
	}
}

SetOption implements renderer.NodeRenderer.SetOption.

func (c *Config) SetOption(name renderer.OptionName, value interface{}) {
	switch name {
	case optHardWraps:
		c.HardWraps = value.(bool)
	case optXHTML:
		c.XHTML = value.(bool)
	case optUnsafe:
		c.Unsafe = value.(bool)
	case optTextWriter:
		c.Writer = value.(Writer)
	}
}

An Option interface sets options for HTML based renderers.

type Option interface {
	SetHTMLOption(*Config)
}

TextWriter is an option name used in WithWriter.

const optTextWriter renderer.OptionName = "Writer"

type withWriter struct {
	value Writer
}

func (o *withWriter) SetConfig(c *renderer.Config) {
	c.Options[optTextWriter] = o.value
}

func (o *withWriter) SetHTMLOption(c *Config) {
	c.Writer = o.value
}

WithWriter is a functional option that allow you to set the given writer to the renderer.

func WithWriter(writer Writer) interface {
	renderer.Option
	Option
} {
	return &withWriter{writer}
}

HardWraps is an option name used in WithHardWraps.

const optHardWraps renderer.OptionName = "HardWraps"

type withHardWraps struct {
}

func (o *withHardWraps) SetConfig(c *renderer.Config) {
	c.Options[optHardWraps] = true
}

func (o *withHardWraps) SetHTMLOption(c *Config) {
	c.HardWraps = true
}

WithHardWraps is a functional option that indicates whether softline breaks should be rendered as '<br>'.

func WithHardWraps() interface {
	renderer.Option
	Option
} {
	return &withHardWraps{}
}

XHTML is an option name used in WithXHTML.

const optXHTML renderer.OptionName = "XHTML"

type withXHTML struct {
}

func (o *withXHTML) SetConfig(c *renderer.Config) {
	c.Options[optXHTML] = true
}

func (o *withXHTML) SetHTMLOption(c *Config) {
	c.XHTML = true
}

WithXHTML is a functional option indicates that nodes should be rendered in xhtml instead of HTML5.

func WithXHTML() interface {
	Option
	renderer.Option
} {
	return &withXHTML{}
}

Unsafe is an option name used in WithUnsafe.

const optUnsafe renderer.OptionName = "Unsafe"

type withUnsafe struct {
}

func (o *withUnsafe) SetConfig(c *renderer.Config) {
	c.Options[optUnsafe] = true
}

func (o *withUnsafe) SetHTMLOption(c *Config) {
	c.Unsafe = true
}

WithUnsafe is a functional option that renders dangerous contents (raw htmls and potentially dangerous links) as it is.

func WithUnsafe() interface {
	renderer.Option
	Option
} {
	return &withUnsafe{}
}

A Renderer struct is an implementation of renderer.NodeRenderer that renders nodes as (X)HTML.

type Renderer struct {
	Config
}

NewRenderer returns a new Renderer with given options.

func NewRenderer(opts ...Option) renderer.NodeRenderer {
	r := &Renderer{
		Config: NewConfig(),
	}

	for _, opt := range opts {
		opt.SetHTMLOption(&r.Config)
	}
	return r
}

RegisterFuncs implements NodeRenderer.RegisterFuncs .

blocks


	reg.Register(ast.KindDocument, r.renderDocument)
	reg.Register(ast.KindHeading, r.renderHeading)
	reg.Register(ast.KindBlockquote, r.renderBlockquote)
	reg.Register(ast.KindCodeBlock, r.renderCodeBlock)
	reg.Register(ast.KindFencedCodeBlock, r.renderFencedCodeBlock)
	reg.Register(ast.KindHTMLBlock, r.renderHTMLBlock)
	reg.Register(ast.KindList, r.renderList)
	reg.Register(ast.KindListItem, r.renderListItem)
	reg.Register(ast.KindParagraph, r.renderParagraph)
	reg.Register(ast.KindTextBlock, r.renderTextBlock)
	reg.Register(ast.KindThematicBreak, r.renderThematicBreak)

inlines


	reg.Register(ast.KindAutoLink, r.renderAutoLink)
	reg.Register(ast.KindCodeSpan, r.renderCodeSpan)
	reg.Register(ast.KindEmphasis, r.renderEmphasis)
	reg.Register(ast.KindImage, r.renderImage)
	reg.Register(ast.KindLink, r.renderLink)
	reg.Register(ast.KindRawHTML, r.renderRawHTML)
	reg.Register(ast.KindText, r.renderText)
	reg.Register(ast.KindString, r.renderString)
}

func (r *Renderer) writeLines(w util.BufWriter, source []byte, n ast.Node) {
	l := n.Lines().Len()
	for i := 0; i < l; i++ {
		line := n.Lines().At(i)
		r.Writer.RawWrite(w, line.Value(source))
	}
}

GlobalAttributeFilter defines attribute names which any elements can have.

var GlobalAttributeFilter = util.NewBytesFilter(
	[]byte("accesskey"),
	[]byte("autocapitalize"),
	[]byte("class"),
	[]byte("contenteditable"),
	[]byte("contextmenu"),
	[]byte("dir"),
	[]byte("draggable"),
	[]byte("dropzone"),
	[]byte("hidden"),
	[]byte("id"),
	[]byte("itemprop"),
	[]byte("lang"),
	[]byte("slot"),
	[]byte("spellcheck"),
	[]byte("style"),
	[]byte("tabindex"),
	[]byte("title"),
	[]byte("translate"),
)

nothing to do

	return ast.WalkContinue, nil
}

HeadingAttributeFilter defines attribute names which heading elements can have

var HeadingAttributeFilter = GlobalAttributeFilter

func (r *Renderer) renderHeading(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
	n := node.(*ast.Heading)
	if entering {
		_, _ = w.WriteString("<h")
		_ = w.WriteByte("0123456"[n.Level])
		if n.Attributes() != nil {
			RenderAttributes(w, node, HeadingAttributeFilter)
		}
		_ = w.WriteByte('>')
	} else {
		_, _ = w.WriteString("</h")
		_ = w.WriteByte("0123456"[n.Level])
		_, _ = w.WriteString(">\n")
	}
	return ast.WalkContinue, nil
}

BlockquoteAttributeFilter defines attribute names which blockquote elements can have

var BlockquoteAttributeFilter = GlobalAttributeFilter.Extend(
	[]byte("cite"),
)

func (r *Renderer) renderBlockquote(w util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) {
	if entering {
		if n.Attributes() != nil {
			_, _ = w.WriteString("<blockquote")
			RenderAttributes(w, n, BlockquoteAttributeFilter)
			_ = w.WriteByte('>')
		} else {
			_, _ = w.WriteString("<blockquote>\n")
		}
	} else {
		_, _ = w.WriteString("</blockquote>\n")
	}
	return ast.WalkContinue, nil
}

func (r *Renderer) renderCodeBlock(w util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) {
	if entering {
		_, _ = w.WriteString("<pre><code>")
		r.writeLines(w, source, n)
	} else {
		_, _ = w.WriteString("</code></pre>\n")
	}
	return ast.WalkContinue, nil
}

func (r *Renderer) renderFencedCodeBlock(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
	n := node.(*ast.FencedCodeBlock)
	if entering {
		_, _ = w.WriteString("<pre><code")
		language := n.Language(source)
		if language != nil {
			_, _ = w.WriteString(" class=\"language-")
			r.Writer.Write(w, language)
			_, _ = w.WriteString("\"")
		}
		_ = w.WriteByte('>')
		r.writeLines(w, source, n)
	} else {
		_, _ = w.WriteString("</code></pre>\n")
	}
	return ast.WalkContinue, nil
}

func (r *Renderer) renderHTMLBlock(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
	n := node.(*ast.HTMLBlock)
	if entering {
		if r.Unsafe {
			l := n.Lines().Len()
			for i := 0; i < l; i++ {
				line := n.Lines().At(i)
				_, _ = w.Write(line.Value(source))
			}
		} else {
			_, _ = w.WriteString("<!-- raw HTML omitted -->\n")
		}
	} else {
		if n.HasClosure() {
			if r.Unsafe {
				closure := n.ClosureLine
				_, _ = w.Write(closure.Value(source))
			} else {
				_, _ = w.WriteString("<!-- raw HTML omitted -->\n")
			}
		}
	}
	return ast.WalkContinue, nil
}

ListAttributeFilter defines attribute names which list elements can have.

var ListAttributeFilter = GlobalAttributeFilter.Extend(
	[]byte("start"),
	[]byte("reversed"),
	[]byte("type"),
)

func (r *Renderer) renderList(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
	n := node.(*ast.List)
	tag := "ul"
	if n.IsOrdered() {
		tag = "ol"
	}
	if entering {
		_ = w.WriteByte('<')
		_, _ = w.WriteString(tag)
		if n.IsOrdered() && n.Start != 1 {
			fmt.Fprintf(w, " start=\"%d\"", n.Start)
		}
		if n.Attributes() != nil {
			RenderAttributes(w, n, ListAttributeFilter)
		}
		_, _ = w.WriteString(">\n")
	} else {
		_, _ = w.WriteString("</")
		_, _ = w.WriteString(tag)
		_, _ = w.WriteString(">\n")
	}
	return ast.WalkContinue, nil
}

ListItemAttributeFilter defines attribute names which list item elements can have.

var ListItemAttributeFilter = GlobalAttributeFilter.Extend(
	[]byte("value"),
)

func (r *Renderer) renderListItem(w util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) {
	if entering {
		if n.Attributes() != nil {
			_, _ = w.WriteString("<li")
			RenderAttributes(w, n, ListItemAttributeFilter)
			_ = w.WriteByte('>')
		} else {
			_, _ = w.WriteString("<li>")
		}
		fc := n.FirstChild()
		if fc != nil {
			if _, ok := fc.(*ast.TextBlock); !ok {
				_ = w.WriteByte('\n')
			}
		}
	} else {
		_, _ = w.WriteString("</li>\n")
	}
	return ast.WalkContinue, nil
}

ParagraphAttributeFilter defines attribute names which paragraph elements can have.

var ParagraphAttributeFilter = GlobalAttributeFilter

func (r *Renderer) renderParagraph(w util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) {
	if entering {
		if n.Attributes() != nil {
			_, _ = w.WriteString("<p")
			RenderAttributes(w, n, ParagraphAttributeFilter)
			_ = w.WriteByte('>')
		} else {
			_, _ = w.WriteString("<p>")
		}
	} else {
		_, _ = w.WriteString("</p>\n")
	}
	return ast.WalkContinue, nil
}

func (r *Renderer) renderTextBlock(w util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) {
	if !entering {
		if _, ok := n.NextSibling().(ast.Node); ok && n.FirstChild() != nil {
			_ = w.WriteByte('\n')
		}
	}
	return ast.WalkContinue, nil
}

ThematicAttributeFilter defines attribute names which hr elements can have.

var ThematicAttributeFilter = GlobalAttributeFilter.Extend(
	[]byte("align"),   // [Deprecated]
	[]byte("color"),   // [Not Standardized]
	[]byte("noshade"), // [Deprecated]
	[]byte("size"),    // [Deprecated]
	[]byte("width"),   // [Deprecated]
)

func (r *Renderer) renderThematicBreak(w util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) {
	if !entering {
		return ast.WalkContinue, nil
	}
	_, _ = w.WriteString("<hr")
	if n.Attributes() != nil {
		RenderAttributes(w, n, ThematicAttributeFilter)
	}
	if r.XHTML {
		_, _ = w.WriteString(" />\n")
	} else {
		_, _ = w.WriteString(">\n")
	}
	return ast.WalkContinue, nil
}

LinkAttributeFilter defines attribute names which link elements can have.

var LinkAttributeFilter = GlobalAttributeFilter.Extend(

[]byte("href"),

	[]byte("hreflang"),
	[]byte("media"),
	[]byte("ping"),
	[]byte("referrerpolicy"),
	[]byte("rel"),
	[]byte("shape"),
	[]byte("target"),
)

func (r *Renderer) renderAutoLink(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
	n := node.(*ast.AutoLink)
	if !entering {
		return ast.WalkContinue, nil
	}
	_, _ = w.WriteString(`<a href="`)
	url := n.URL(source)
	label := n.Label(source)
	if n.AutoLinkType == ast.AutoLinkEmail && !bytes.HasPrefix(bytes.ToLower(url), []byte("mailto:")) {
		_, _ = w.WriteString("mailto:")
	}
	_, _ = w.Write(util.EscapeHTML(util.URLEscape(url, false)))
	if n.Attributes() != nil {
		_ = w.WriteByte('"')
		RenderAttributes(w, n, LinkAttributeFilter)
		_ = w.WriteByte('>')
	} else {
		_, _ = w.WriteString(`">`)
	}
	_, _ = w.Write(util.EscapeHTML(label))
	_, _ = w.WriteString(`</a>`)
	return ast.WalkContinue, nil
}

CodeAttributeFilter defines attribute names which code elements can have.

var CodeAttributeFilter = GlobalAttributeFilter

func (r *Renderer) renderCodeSpan(w util.BufWriter, source []byte, n ast.Node, entering bool) (ast.WalkStatus, error) {
	if entering {
		if n.Attributes() != nil {
			_, _ = w.WriteString("<code")
			RenderAttributes(w, n, CodeAttributeFilter)
			_ = w.WriteByte('>')
		} else {
			_, _ = w.WriteString("<code>")
		}
		for c := n.FirstChild(); c != nil; c = c.NextSibling() {
			segment := c.(*ast.Text).Segment
			value := segment.Value(source)
			if bytes.HasSuffix(value, []byte("\n")) {
				r.Writer.RawWrite(w, value[:len(value)-1])
				if c != n.LastChild() {
					r.Writer.RawWrite(w, []byte(" "))
				}
			} else {
				r.Writer.RawWrite(w, value)
			}
		}
		return ast.WalkSkipChildren, nil
	}
	_, _ = w.WriteString("</code>")
	return ast.WalkContinue, nil
}

EmphasisAttributeFilter defines attribute names which emphasis elements can have.

var EmphasisAttributeFilter = GlobalAttributeFilter

func (r *Renderer) renderEmphasis(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
	n := node.(*ast.Emphasis)
	tag := "em"
	if n.Level == 2 {
		tag = "strong"
	}
	if entering {
		_ = w.WriteByte('<')
		_, _ = w.WriteString(tag)
		if n.Attributes() != nil {
			RenderAttributes(w, n, EmphasisAttributeFilter)
		}
		_ = w.WriteByte('>')
	} else {
		_, _ = w.WriteString("</")
		_, _ = w.WriteString(tag)
		_ = w.WriteByte('>')
	}
	return ast.WalkContinue, nil
}

func (r *Renderer) renderLink(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
	n := node.(*ast.Link)
	if entering {
		_, _ = w.WriteString("<a href=\"")
		if r.Unsafe || !IsDangerousURL(n.Destination) {
			_, _ = w.Write(util.EscapeHTML(util.URLEscape(n.Destination, true)))
		}
		_ = w.WriteByte('"')
		if n.Title != nil {
			_, _ = w.WriteString(` title="`)
			r.Writer.Write(w, n.Title)
			_ = w.WriteByte('"')
		}
		if n.Attributes() != nil {
			RenderAttributes(w, n, LinkAttributeFilter)
		}
		_ = w.WriteByte('>')
	} else {
		_, _ = w.WriteString("</a>")
	}
	return ast.WalkContinue, nil
}

ImageAttributeFilter defines attribute names which image elements can have.

var ImageAttributeFilter = GlobalAttributeFilter.Extend(
	[]byte("align"),
	[]byte("border"),
	[]byte("crossorigin"),
	[]byte("decoding"),
	[]byte("height"),
	[]byte("importance"),
	[]byte("intrinsicsize"),
	[]byte("ismap"),
	[]byte("loading"),
	[]byte("referrerpolicy"),
	[]byte("sizes"),
	[]byte("srcset"),
	[]byte("usemap"),
	[]byte("width"),
)

func (r *Renderer) renderImage(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
	if !entering {
		return ast.WalkContinue, nil
	}
	n := node.(*ast.Image)
	_, _ = w.WriteString("<img src=\"")
	if r.Unsafe || !IsDangerousURL(n.Destination) {
		_, _ = w.Write(util.EscapeHTML(util.URLEscape(n.Destination, true)))
	}
	_, _ = w.WriteString(`" alt="`)
	_, _ = w.Write(util.EscapeHTML(n.Text(source)))
	_ = w.WriteByte('"')
	if n.Title != nil {
		_, _ = w.WriteString(` title="`)
		r.Writer.Write(w, n.Title)
		_ = w.WriteByte('"')
	}
	if n.Attributes() != nil {
		RenderAttributes(w, n, ImageAttributeFilter)
	}
	if r.XHTML {
		_, _ = w.WriteString(" />")
	} else {
		_, _ = w.WriteString(">")
	}
	return ast.WalkSkipChildren, nil
}

func (r *Renderer) renderRawHTML(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
	if !entering {
		return ast.WalkSkipChildren, nil
	}
	if r.Unsafe {
		n := node.(*ast.RawHTML)
		l := n.Segments.Len()
		for i := 0; i < l; i++ {
			segment := n.Segments.At(i)
			_, _ = w.Write(segment.Value(source))
		}
		return ast.WalkSkipChildren, nil
	}
	_, _ = w.WriteString("<!-- raw HTML omitted -->")
	return ast.WalkSkipChildren, nil
}

func (r *Renderer) renderText(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
	if !entering {
		return ast.WalkContinue, nil
	}
	n := node.(*ast.Text)
	segment := n.Segment
	if n.IsRaw() {
		r.Writer.RawWrite(w, segment.Value(source))
	} else {
		r.Writer.Write(w, segment.Value(source))
		if n.HardLineBreak() || (n.SoftLineBreak() && r.HardWraps) {
			if r.XHTML {
				_, _ = w.WriteString("<br />\n")
			} else {
				_, _ = w.WriteString("<br>\n")
			}
		} else if n.SoftLineBreak() {
			_ = w.WriteByte('\n')
		}
	}
	return ast.WalkContinue, nil
}

func (r *Renderer) renderString(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
	if !entering {
		return ast.WalkContinue, nil
	}
	n := node.(*ast.String)
	if n.IsCode() {
		_, _ = w.Write(n.Value)
	} else {
		if n.IsRaw() {
			r.Writer.RawWrite(w, n.Value)
		} else {
			r.Writer.Write(w, n.Value)
		}
	}
	return ast.WalkContinue, nil
}

var dataPrefix = []byte("data-")

RenderAttributes renders given node's attributes. You can specify attribute names to render by the filter. If filter is nil, RenderAttributes renders all attributes.

func RenderAttributes(w util.BufWriter, node ast.Node, filter util.BytesFilter) {
	for _, attr := range node.Attributes() {
		if filter != nil && !filter.Contains(attr.Name) {
			if !bytes.HasPrefix(attr.Name, dataPrefix) {
				continue
			}
		}
		_, _ = w.WriteString(" ")
		_, _ = w.Write(attr.Name)

TODO: convert numeric values to strings

		_, _ = w.Write(util.EscapeHTML(attr.Value.([]byte)))
		_ = w.WriteByte('"')
	}
}

A Writer interface writes textual contents to a writer.

Write writes the given source to writer with resolving references and unescaping backslash escaped characters.

	Write(writer util.BufWriter, source []byte)

RawWrite writes the given source to writer without resolving references and unescaping backslash escaped characters.

	RawWrite(writer util.BufWriter, source []byte)
}

type defaultWriter struct {
}

func escapeRune(writer util.BufWriter, r rune) {
	if r < 256 {
		v := util.EscapeHTMLByte(byte(r))
		if v != nil {
			_, _ = writer.Write(v)
			return
		}
	}
	_, _ = writer.WriteRune(util.ToValidRune(r))
}

func (d *defaultWriter) RawWrite(writer util.BufWriter, source []byte) {
	n := 0
	l := len(source)
	for i := 0; i < l; i++ {
		v := util.EscapeHTMLByte(source[i])
		if v != nil {
			_, _ = writer.Write(source[i-n : i])
			n = 0
			_, _ = writer.Write(v)
			continue
		}
		n++
	}
	if n != 0 {
		_, _ = writer.Write(source[l-n:])
	}
}

func (d *defaultWriter) Write(writer util.BufWriter, source []byte) {
	escaped := false
	var ok bool
	limit := len(source)
	n := 0
	for i := 0; i < limit; i++ {
		c := source[i]
		if escaped {
			if util.IsPunct(c) {
				d.RawWrite(writer, source[n:i-1])
				n = i
				escaped = false
				continue
			}
		}
		if c == '&' {
			pos := i
			next := i + 1
			if next < limit && source[next] == '#' {
				nnext := next + 1
				if nnext < limit {

code point like #x22;

					if nnext < limit && nc == 'x' || nc == 'X' {
						start := nnext + 1
						i, ok = util.ReadWhile(source, [2]int{start, limit}, util.IsHexDecimal)
						if ok && i < limit && source[i] == ';' {
							v, _ := strconv.ParseUint(util.BytesToReadOnlyString(source[start:i]), 16, 32)
							d.RawWrite(writer, source[n:pos])
							n = i + 1
							escapeRune(writer, rune(v))
							continue

code point like #1234;

					} else if nc >= '0' && nc <= '9' {
						start := nnext
						i, ok = util.ReadWhile(source, [2]int{start, limit}, util.IsNumeric)
						if ok && i < limit && i-start < 8 && source[i] == ';' {
							v, _ := strconv.ParseUint(util.BytesToReadOnlyString(source[start:i]), 0, 32)
							d.RawWrite(writer, source[n:pos])
							n = i + 1
							escapeRune(writer, rune(v))
							continue
						}
					}
				}
			} else {
				start := next

entity reference

				if ok && i < limit && source[i] == ';' {
					name := util.BytesToReadOnlyString(source[start:i])
					entity, ok := util.LookUpHTML5EntityByName(name)
					if ok {
						d.RawWrite(writer, source[n:pos])
						n = i + 1
						d.RawWrite(writer, entity.Characters)
						continue
					}
				}
			}
			i = next - 1
		}
		if c == '\\' {
			escaped = true
			continue
		}
		escaped = false
	}
	d.RawWrite(writer, source[n:])
}

DefaultWriter is a default implementation of the Writer.

var DefaultWriter = &defaultWriter{}

var bDataImage = []byte("data:image/")
var bPng = []byte("png;")
var bGif = []byte("gif;")
var bJpeg = []byte("jpeg;")
var bWebp = []byte("webp;")
var bJs = []byte("javascript:")
var bVb = []byte("vbscript:")
var bFile = []byte("file:")
var bData = []byte("data:")

IsDangerousURL returns true if the given url seems a potentially dangerous url, otherwise false.

func IsDangerousURL(url []byte) bool {
	if bytes.HasPrefix(url, bDataImage) && len(url) >= 11 {
		v := url[11:]
		if bytes.HasPrefix(v, bPng) || bytes.HasPrefix(v, bGif) ||
			bytes.HasPrefix(v, bJpeg) || bytes.HasPrefix(v, bWebp) {
			return false
		}
		return true
	}
	return bytes.HasPrefix(url, bJs) || bytes.HasPrefix(url, bVb) ||
		bytes.HasPrefix(url, bFile) || bytes.HasPrefix(url, bData)