https://freemarker.apache.org/: FreeMarker is a "template engine"; a generic tool to generate text output based on templates. (Apache Software Foundation) 
public final class freemarker.core.HTMLOutputFormat extends freemarker.core.CommonMarkupOutputFormat<freemarker.core.TemplateHTMLOutputModel>
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: freemarker.core.HTMLOutputFormat
  super_class: freemarker.core.CommonMarkupOutputFormat
{
  public static final freemarker.core.HTMLOutputFormat INSTANCE;
    descriptor: Lfreemarker/core/HTMLOutputFormat;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 39
            new freemarker.core.HTMLOutputFormat
            dup
            invokespecial freemarker.core.HTMLOutputFormat.<init>:()V
            putstatic freemarker.core.HTMLOutputFormat.INSTANCE:Lfreemarker/core/HTMLOutputFormat;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // freemarker.core.HTMLOutputFormat this
         0: .line 41
            aload 0 /* this */
            invokespecial freemarker.core.CommonMarkupOutputFormat.<init>:()V
         1: .line 43
            return
        end local 0 // freemarker.core.HTMLOutputFormat this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lfreemarker/core/HTMLOutputFormat;

  public java.lang.String getName();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // freemarker.core.HTMLOutputFormat this
         0: .line 47
            ldc "HTML"
            areturn
        end local 0 // freemarker.core.HTMLOutputFormat this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lfreemarker/core/HTMLOutputFormat;

  public java.lang.String getMimeType();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // freemarker.core.HTMLOutputFormat this
         0: .line 52
            ldc "text/html"
            areturn
        end local 0 // freemarker.core.HTMLOutputFormat this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lfreemarker/core/HTMLOutputFormat;

  public void output(java.lang.String, java.io.Writer);
    descriptor: (Ljava/lang/String;Ljava/io/Writer;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // freemarker.core.HTMLOutputFormat this
        start local 1 // java.lang.String textToEsc
        start local 2 // java.io.Writer out
         0: .line 57
            aload 1 /* textToEsc */
            aload 2 /* out */
            invokestatic freemarker.template.utility.StringUtil.XHTMLEnc:(Ljava/lang/String;Ljava/io/Writer;)V
         1: .line 58
            return
        end local 2 // java.io.Writer out
        end local 1 // java.lang.String textToEsc
        end local 0 // freemarker.core.HTMLOutputFormat this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    2     0       this  Lfreemarker/core/HTMLOutputFormat;
            0    2     1  textToEsc  Ljava/lang/String;
            0    2     2        out  Ljava/io/Writer;
    Exceptions:
      throws java.io.IOException, freemarker.template.TemplateModelException
    MethodParameters:
           Name  Flags
      textToEsc  
      out        

  public java.lang.String escapePlainText(java.lang.String);
    descriptor: (Ljava/lang/String;)Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // freemarker.core.HTMLOutputFormat this
        start local 1 // java.lang.String plainTextContent
         0: .line 62
            aload 1 /* plainTextContent */
            invokestatic freemarker.template.utility.StringUtil.XHTMLEnc:(Ljava/lang/String;)Ljava/lang/String;
            areturn
        end local 1 // java.lang.String plainTextContent
        end local 0 // freemarker.core.HTMLOutputFormat this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    1     0              this  Lfreemarker/core/HTMLOutputFormat;
            0    1     1  plainTextContent  Ljava/lang/String;
    MethodParameters:
                  Name  Flags
      plainTextContent  

  public boolean isLegacyBuiltInBypassed(java.lang.String);
    descriptor: (Ljava/lang/String;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // freemarker.core.HTMLOutputFormat this
        start local 1 // java.lang.String builtInName
         0: .line 67
            aload 1 /* builtInName */
            ldc "html"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 1
            aload 1 /* builtInName */
            ldc "xml"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 1
            aload 1 /* builtInName */
            ldc "xhtml"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifne 1
            iconst_0
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_1
            ireturn
        end local 1 // java.lang.String builtInName
        end local 0 // freemarker.core.HTMLOutputFormat this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    2     0         this  Lfreemarker/core/HTMLOutputFormat;
            0    2     1  builtInName  Ljava/lang/String;
    MethodParameters:
             Name  Flags
      builtInName  

  protected freemarker.core.TemplateHTMLOutputModel newTemplateMarkupOutputModel(java.lang.String, java.lang.String);
    descriptor: (Ljava/lang/String;Ljava/lang/String;)Lfreemarker/core/TemplateHTMLOutputModel;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=4, locals=3, args_size=3
        start local 0 // freemarker.core.HTMLOutputFormat this
        start local 1 // java.lang.String plainTextContent
        start local 2 // java.lang.String markupContent
         0: .line 72
            new freemarker.core.TemplateHTMLOutputModel
            dup
            aload 1 /* plainTextContent */
            aload 2 /* markupContent */
            invokespecial freemarker.core.TemplateHTMLOutputModel.<init>:(Ljava/lang/String;Ljava/lang/String;)V
            areturn
        end local 2 // java.lang.String markupContent
        end local 1 // java.lang.String plainTextContent
        end local 0 // freemarker.core.HTMLOutputFormat this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    1     0              this  Lfreemarker/core/HTMLOutputFormat;
            0    1     1  plainTextContent  Ljava/lang/String;
            0    1     2     markupContent  Ljava/lang/String;
    MethodParameters:
                  Name  Flags
      plainTextContent  
      markupContent     

  protected freemarker.core.CommonTemplateMarkupOutputModel newTemplateMarkupOutputModel(java.lang.String, java.lang.String);
    descriptor: (Ljava/lang/String;Ljava/lang/String;)Lfreemarker/core/CommonTemplateMarkupOutputModel;
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            aload 2
            invokevirtual freemarker.core.HTMLOutputFormat.newTemplateMarkupOutputModel:(Ljava/lang/String;Ljava/lang/String;)Lfreemarker/core/TemplateHTMLOutputModel;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Exceptions:
      throws freemarker.template.TemplateModelException
}
Signature: Lfreemarker/core/CommonMarkupOutputFormat<Lfreemarker/core/TemplateHTMLOutputModel;>;
SourceFile: "HTMLOutputFormat.java"