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## net.htmlparser.jericho
Class Renderer

    java.lang.Object
      Renderer

All Implemented Interfaces:
  CharStreamSource

    public class Renderer

extends java.lang.Object
implements CharStreamSource

Performs a simple rendering of HTML markup into text.

This provides a human readable version of the segment content that is modelled on the way Mozilla Thunderbird and other email clients provide an automatic conversion of HTML content to text in their alternative MIME encoding of emails.

The output using default settings complies with the "text/plain; format=flowed" (DelSp=No) protocol described in RFC3676.

Many properties are available to customise the output, possibly the most significant of which being `MaxLineLength`. See the individual property descriptions for details.

Use one of the following methods to obtain the output:

- `writeTo(Writer)`
- `appendTo(Appendable)`
- `toString()`
- `CharStreamSourceUtil.getReader(this)`

The rendering of some constructs, especially tables, is very rudimentary. No attempt is made to render nested tables properly, except to ensure that all of the text content is included in the output.

Rendering an entire `Source` object performs a full sequential parse automatically.

Any aspect of the algorithm not specifically mentioned here is subject to change without notice in future versions.

To extract pure text without any rendering of the markup, use the `TextExtractor` class instead.

Constructor Summary
`Renderer(Segment segment)` Constructs a new `Renderer` based on the specified `Segment`.

Method Summary
`void` | `appendTo(java.lang.Appendable appendable)` Appends the output to the specified `Appendable` object.
`int` | `getBlockIndentSize()` Returns the size of the indent to be used for anything other than `LI` elements.
`boolean` | `getConvertNonBreakingSpaces()` Indicates whether non-breaking space (`&nbsp;`) character entity references are converted to spaces.
`boolean` | `getDecorateFontStyles()` Indicates whether decoration characters are to be included around the content of some font style elements and phrase elements.
`static int` | `getDefaultBottomMargin(java.lang.String htmlElementName)` Returns the default bottom margin of an HTML block element with the specified name.
`static int` | `getDefaultTopMargin(java.lang.String htmlElementName)` Returns the default top margin of an HTML block element with the specified name.
`long` | `getEstimatedMaximumOutputLength()` Returns the estimated maximum number of characters in the output, or `-1` if no estimate is available.
`boolean` | `getIncludeAlternateText()` Indicates whether the alternate text of a tag that has an `alt` attribute is included in the output.
`boolean` | `getIncludeFirstElementTopMargin()` Indicates whether the top margin of the first element is rendered.
`boolean` | `getIncludeHyperlinkURLs()` Indicates whether hyperlink URLs are included in the output.
`char[]` | `getListBullets()` Returns the bullet characters to use for list items inside `UL` elements.
`int` | `getListIndentSize()` Returns the size of the indent to be used for `LI` elements.
`int` | `getMaxLineLength()` Returns the column at which lines are to be wrapped.
`java.lang.String` | `getNewLine()` Returns the string to be used to represent a newline in the output.
`java.lang.String` | `getTableCellSeparator()` Returns the string that is to separate table cells.
`static boolean` | `isDefaultIndent(java.lang.String htmlElementName)` Returns the default value of whether an HTML block element of the specified name is indented.
`java.lang.String` | `renderAlternateText(StartTag startTag)` Renders the alternate text of the specified start tag.
`java.lang.String` | `renderHyperlinkURL(StartTag startTag)` Renders the hyperlink URL from the specified `StartTag`.
`Renderer` | `setBlockIndentSize(int blockIndentSize)` Sets the size of the indent to be used for anything other than `LI` elements.
`Renderer` | `setConvertNonBreakingSpaces(boolean convertNonBreakingSpaces)` Sets whether non-breaking space (`&nbsp;`) character entity references are converted to spaces.
`Renderer` | `setDecorateFontStyles(boolean decorateFontStyles)` Sets whether decoration characters are to be included around the content of some font style elements and phrase elements.
`static void` | `setDefaultBottomMargin(java.lang.String htmlElementName, int bottomMargin)` Sets the default bottom margin of an HTML block element with the specified name.
`static void` | `setDefaultIndent(java.lang.String htmlElementName, boolean indent)` Sets the default value of whether an HTML block element of the specified name is indented.
`static void` | `setDefaultTopMargin(java.lang.String htmlElementName, int topMargin)` Sets the default top margin of an HTML block element with the specified name.
`Renderer` | `setIncludeAlternateText(boolean includeAlternateText)` Sets whether the alternate text of a tag that has an `alt` attribute is included in the output.
`Renderer` | `setIncludeFirstElementTopMargin(boolean includeFirstElementTopMargin)` Sets whether the top margin of the first element is rendered.
`Renderer` | `setIncludeHyperlinkURLs(boolean includeHyperlinkURLs)` Sets whether hyperlink URLs are included in the output.
`Renderer` | `setListBullets(char[] listBullets)` Sets the bullet characters to use for list items inside `UL` elements.
`Renderer` | `setListIndentSize(int listIndentSize)` Sets the size of the indent to be used for `LI` elements.
`Renderer` | `setMaxLineLength(int maxLineLength)` Sets the column at which lines are to be wrapped.
`Renderer` | `setNewLine(java.lang.String newLine)` Sets the string to be used to represent a newline in the output.
`Renderer` | `setTableCellSeparator(java.lang.String tableCellSeparator)` Sets the string that is to separate table cells.
`java.lang.String` | `toString()` Returns the output as a string.
`void` | `writeTo(java.io.Writer writer)` Writes the output to the specified `Writer`.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### Renderer

    public Renderer(Segment segment)

  Constructs a new `Renderer` based on the specified `Segment`.

  Parameters:
    `segment` - the segment containing the HTML to be rendered.
  See Also:
    `Segment.getRenderer()`

Method Detail

### writeTo

    public void writeTo(java.io.Writer writer)
                 throws java.io.IOException

  Description copied from interface: `CharStreamSource`
  Writes the output to the specified `Writer`.

  Specified by:
    `writeTo` in interface `CharStreamSource`
  Parameters:
    `writer` - the destination `java.io.Writer` for the output.
  Throws:
    `java.io.IOException` - if an I/O exception occurs.

### appendTo

    public void appendTo(java.lang.Appendable appendable)
                  throws java.io.IOException

  Description copied from interface: `CharStreamSource`
  Appends the output to the specified `Appendable` object.

  Specified by:
    `appendTo` in interface `CharStreamSource`
  Parameters:
    `appendable` - the destination `java.lang.Appendable` object for the output.
  Throws:
    `java.io.IOException` - if an I/O exception occurs.

### getEstimatedMaximumOutputLength

    public long getEstimatedMaximumOutputLength()

  Description copied from interface: `CharStreamSource`
  Returns the estimated maximum number of characters in the output, or `-1` if no estimate is available.

  The returned value should be used as a guide for efficiency purposes only, for example to set an initial `StringBuilder` capacity. There is no guarantee that the length of the output is indeed less than this value, as classes implementing this method often use assumptions based on typical usage to calculate the estimate.

  Although implementations of this method should never return a value less than -1, users of this method must not assume that this will always be the case. Standard practice is to interpret any negative value as meaning that no estimate is available.

  Specified by:
    `getEstimatedMaximumOutputLength` in interface `CharStreamSource`
  Returns:
    the estimated maximum number of characters in the output, or `-1` if no estimate is available.

### toString

    public java.lang.String toString()

  Description copied from interface: `CharStreamSource`
  Returns the output as a string.

  Specified by:
    `toString` in interface `CharStreamSource`
  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    the output as a string.

### setMaxLineLength

    public Renderer setMaxLineLength(int maxLineLength)

  Sets the column at which lines are to be wrapped.

  Lines that would otherwise exceed this length are wrapped onto a new line at a word boundary.

  A Line may still exceed this length if it consists of a single word, where the length of the word plus the line indent exceeds the maximum length. In this case the line is wrapped immediately after the end of the word.

  The default value is `76`, which reflects the maximum line length for sending email data specified in RFC2049 section 3.5.

  Parameters:
    `maxLineLength` - the column at which lines are to be wrapped.
  Returns:
    this `Renderer` instance, allowing multiple property setting methods to be chained in a single statement.
  See Also:
    `getMaxLineLength()`

### getMaxLineLength

    public int getMaxLineLength()

  Returns the column at which lines are to be wrapped.

  See the `setMaxLineLength(int)` method for a full description of this property.

  Returns:
    the column at which lines are to be wrapped.

### setNewLine

    public Renderer setNewLine(java.lang.String newLine)

  Sets the string to be used to represent a newline in the output.

  The default value is `"\r\n"` (CR+LF) regardless of the platform on which the library is running. This is so that the default configuration produces valid MIME plain/text output, which mandates the use of CR+LF for line breaks.

  Specifying a `null` argument causes the output to use same new line string as is used in the source document, which is determined via the `Source.getNewLine()` method. If the source document does not contain any new lines, a "best guess" is made by either taking the new line string of a previously parsed document, or using the value from the static `Config.NewLine` property.

  Parameters:
    `newLine` - the string to be used to represent a newline in the output, may be `null`.
  Returns:
    this `Renderer` instance, allowing multiple property setting methods to be chained in a single statement.
  See Also:
    `getNewLine()`

### getNewLine

    public java.lang.String getNewLine()

  Returns the string to be used to represent a newline in the output.

  See the `setNewLine(String)` method for a full description of this property.

  Returns:
    the string to be used to represent a newline in the output.

### setIncludeHyperlinkURLs

    public Renderer setIncludeHyperlinkURLs(boolean includeHyperlinkURLs)

  Sets whether hyperlink URLs are included in the output.

  The default value is `true`.

  When this property is `true`, the URL of each hyperlink is included in the output as determined by the implementation of the `renderHyperlinkURL(StartTag)` method.

  Example:

    Assuming the default implementation of `renderHyperlinkURL(StartTag)`, when this property is `true`, the following HTML:

    > `<a href="http://jericho.htmlparser.net/">Jericho HTML Parser</a>`

    produces the following output:

    > `Jericho HTML Parser <http://jericho.htmlparser.net/>`

  Parameters:
    `includeHyperlinkURLs` - specifies whether hyperlink URLs are included in the output.
  Returns:
    this `Renderer` instance, allowing multiple property setting methods to be chained in a single statement.
  See Also:
    `getIncludeHyperlinkURLs()`

### getIncludeHyperlinkURLs

    public boolean getIncludeHyperlinkURLs()

  Indicates whether hyperlink URLs are included in the output.

  See the `setIncludeHyperlinkURLs(boolean)` method for a full description of this property.

  Returns:
    `true` if hyperlink URLs are included in the output, otherwise `false`.

### renderHyperlinkURL

    public java.lang.String renderHyperlinkURL(StartTag startTag)

  Renders the hyperlink URL from the specified `StartTag`.

  A return value of `null` indicates that the hyperlink URL should not be rendered at all.

  The default implementation of this method returns `null` if the `href` attribute of the specified start tag is '`#`', starts with "`javascript:`", or is missing. In all other cases it returns the value of the `href` attribute enclosed in angle brackets.

  See the documentation of the `setIncludeHyperlinkURLs(boolean)` method for an example of how a hyperlink is rendered by the default implementation.

  This method can be overridden in a subclass to customise the rendering of hyperlink URLs.

  Rendering of hyperlink URLs can be disabled completely without overriding this method by setting the `IncludeHyperlinkURLs` property to `false`.

  Example:
    To render hyperlink URLs without the enclosing angle brackets:
    `Renderer renderer=new Renderer(segment) {
    public String renderHyperlinkURL(StartTag startTag) {
    String href=startTag.getAttributeValue("href");
    if (href==null || href.equals("#") || href.startsWith("javascript:")) return null;
    return href;
    }
    };
    String renderedSegment=renderer.toString();`

  Parameters:
    `startTag` - the start tag of the hyperlink element, must not be `null`.
  Returns:
    The rendered hyperlink URL from the specified `StartTag`, or `null` if the hyperlink URL should not be rendered.

### setIncludeAlternateText

    public Renderer setIncludeAlternateText(boolean includeAlternateText)

  Sets whether the alternate text of a tag that has an `alt` attribute is included in the output.

  The default value is `true`. Note that this is not conistent with common email clients such as Mozilla Thunderbird which do not render alternate text at all, even when a tag specifies alternate text.

  When this property is `true`, the alternate text is included in the output as determined by the implementation of the `renderAlternateText(StartTag)` method.

  Example:

    Assuming the default implementation of `renderAlternateText(StartTag)`, when this property is `true`, the following HTML:

    > `<img src="smiley.png" alt="smiley face" />`

    produces the following output:

    > `[smiley face]`

  Parameters:
    `includeAlternateText` - specifies whether the alternate text of a tag that has an `alt` attribute is included in the output.
  Returns:
    this `Renderer` instance, allowing multiple property setting methods to be chained in a single statement.
  See Also:
    `getIncludeAlternateText()`

### getIncludeAlternateText

    public boolean getIncludeAlternateText()

  Indicates whether the alternate text of a tag that has an `alt` attribute is included in the output.

  See the `setIncludeAlternateText(boolean)` method for a full description of this property.

  Returns:
    `true` if the alternate text of a tag that has an `alt` attribute is included in the output, otherwise `false`.

### renderAlternateText

    public java.lang.String renderAlternateText(StartTag startTag)

  Renders the alternate text of the specified start tag.

  A return value of `null` indicates that the alternate text is not to be rendered at all.

  The default implementation of this method returns `null` if the `alt` attribute of the specified start tag is missing or empty, or if the specified start tag is from an `AREA` element. In all other cases it returns the value of the `alt` attribute enclosed in square brackets `[…]`.

  See the documentation of the `setIncludeAlternateText(boolean)` method for an example of how alternate text is rendered by the default implementation.

  This method can be overridden in a subclass to customise the rendering of alternate text.

  Rendering of alternate text can be disabled completely without overriding this method by setting the `IncludeAlternateText` property to `false`.

  Example:
    To render alternate text with double angle quotation marks instead of square brackets:
    `Renderer renderer=new Renderer(segment) {
    public String renderAlternateText(StartTag startTag) {
    if (startTag.getName()==HTMLElementName.AREA) return null; String alt=startTag.getAttributeValue("alt");
    if (alt==null || alt.length()==0) return null;
    return '«'+alt+'»';
    }
    };
    String renderedSegment=renderer.toString();`

  Parameters:
    `startTag` - the start tag containing an `alt` attribute, must not be `null`.
  Returns:
    The rendered alternate text, or `null` if the alternate text should not be rendered.

### setDecorateFontStyles

    public Renderer setDecorateFontStyles(boolean decorateFontStyles)

  Sets whether decoration characters are to be included around the content of some font style elements and phrase elements.

  The default value is `false`.

  Below is a table summarising the decorated elements.

  Elements | Character | Example Output
  --- | --- | ---
  `B` and `STRONG` | `*` | `*bold text*`
  `I` and `EM` | `/` | `/italic text/`
  `U` | `_` | `_underlined text_`
  `CODE` | `|` | `|code|`

  Parameters:
    `decorateFontStyles` - specifies whether decoration characters are to be included around the content of some font style elements.
  Returns:
    this `Renderer` instance, allowing multiple property setting methods to be chained in a single statement.
  See Also:
    `getDecorateFontStyles()`

### getDecorateFontStyles

    public boolean getDecorateFontStyles()

  Indicates whether decoration characters are to be included around the content of some font style elements and phrase elements.

  See the `setDecorateFontStyles(boolean)` method for a full description of this property.

  Returns:
    `true` if decoration characters are to be included around the content of some font style elements, otherwise `false`.

### setConvertNonBreakingSpaces

    public Renderer setConvertNonBreakingSpaces(boolean convertNonBreakingSpaces)

  Sets whether non-breaking space (`&nbsp;`) character entity references are converted to spaces.

  The default value is that of the static `Config.ConvertNonBreakingSpaces` property at the time the `Renderer` is instantiated.

  Parameters:
    `convertNonBreakingSpaces` - specifies whether non-breaking space (`&nbsp;`) character entity references are converted to spaces.
  Returns:
    this `Renderer` instance, allowing multiple property setting methods to be chained in a single statement.
  See Also:
    `getConvertNonBreakingSpaces()`

### getConvertNonBreakingSpaces

    public boolean getConvertNonBreakingSpaces()

  Indicates whether non-breaking space (`&nbsp;`) character entity references are converted to spaces.

  See the `setConvertNonBreakingSpaces(boolean)` method for a full description of this property.

  Returns:
    `true` if non-breaking space (`&nbsp;`) character entity references are converted to spaces, otherwise `false`.

### setBlockIndentSize

    public Renderer setBlockIndentSize(int blockIndentSize)

  Sets the size of the indent to be used for anything other than `LI` elements.

  At present this applies to `BLOCKQUOTE` and `DD` elements.

  The default value is `4`.

  Parameters:
    `blockIndentSize` - the size of the indent.
  Returns:
    this `Renderer` instance, allowing multiple property setting methods to be chained in a single statement.
  See Also:
    `getBlockIndentSize()`

### getBlockIndentSize

    public int getBlockIndentSize()

  Returns the size of the indent to be used for anything other than `LI` elements.

  See the `setBlockIndentSize(int)` method for a full description of this property.

  Returns:
    the size of the indent to be used for anything other than `LI` elements.

### setListIndentSize

    public Renderer setListIndentSize(int listIndentSize)

  Sets the size of the indent to be used for `LI` elements.

  The default value is `6`.

  This applies to `LI` elements inside both `UL` and `OL` elements.

  The bullet or number of the list item is included as part of the indent.

  Parameters:
    `listIndentSize` - the size of the indent.
  Returns:
    this `Renderer` instance, allowing multiple property setting methods to be chained in a single statement.
  See Also:
    `getListIndentSize()`

### getListIndentSize

    public int getListIndentSize()

  Returns the size of the indent to be used for `LI` elements.

  See the `setListIndentSize(int)` method for a full description of this property.

  Returns:
    the size of the indent to be used for `LI` elements.

### setListBullets

    public Renderer setListBullets(char[] listBullets)

  Sets the bullet characters to use for list items inside `UL` elements.

  The values in the default array are `*`, `o`, `+` and `#`.

  If the nesting of rendered lists goes deeper than the length of this array, the bullet characters start repeating from the first in the array.

  WARNING: If any of the characters in the default array are modified, this will affect all other instances of this class using the default array.

  Parameters:
    `listBullets` - an array of characters to be used as bullets, must have at least one entry.
  Returns:
    this `Renderer` instance, allowing multiple property setting methods to be chained in a single statement.
  See Also:
    `getListBullets()`

### getListBullets

    public char[] getListBullets()

  Returns the bullet characters to use for list items inside `UL` elements.

  See the `setListBullets(char[])` method for a full description of this property.

  Returns:
    the bullet characters to use for list items inside `UL` elements.

### setIncludeFirstElementTopMargin

    public Renderer setIncludeFirstElementTopMargin(boolean includeFirstElementTopMargin)

  Sets whether the top margin of the first element is rendered.

  The default value is `false`.

  If this property is set to `true`, then the source "`<h1>Heading</h1>`" would be rendered as "`\r\n\r\nHeading`", assuming all other default settings. If this property is `false`, then the same source would be rendered as "`Heading`".

  Note that the bottom margin of the last element is never rendered.

  Parameters:
    `includeFirstElementTopMargin` - specifies whether the top margin of the first element is rendered.
  Returns:
    this `Renderer` instance, allowing multiple property setting methods to be chained in a single statement.
  See Also:
    `getIncludeFirstElementTopMargin()`

### getIncludeFirstElementTopMargin

    public boolean getIncludeFirstElementTopMargin()

  Indicates whether the top margin of the first element is rendered.

  See the `setIncludeFirstElementTopMargin(boolean)` method for a full description of this property.

  Returns:
    `true` if the top margin of the first element is rendered, otherwise `false`.

### setTableCellSeparator

    public Renderer setTableCellSeparator(java.lang.String tableCellSeparator)

  Sets the string that is to separate table cells.

  The default value is `" \t"` (a space followed by a tab).

  Parameters:
    `tableCellSeparator` - the string that is to separate table cells.
  Returns:
    this `Renderer` instance, allowing multiple property setting methods to be chained in a single statement.
  See Also:
    `getTableCellSeparator()`

### getTableCellSeparator

    public java.lang.String getTableCellSeparator()

  Returns the string that is to separate table cells.

  See the `setTableCellSeparator(String)` method for a full description of this property.

  Returns:
    the string that is to separate table cells.

### setDefaultTopMargin

    public static void setDefaultTopMargin(java.lang.String htmlElementName,
                                           int topMargin)

  Sets the default top margin of an HTML block element with the specified name.

  The top margin is the number of blank lines that are to be inserted above the rendered block.

  As this is a static method, the setting affects all instances of the `Renderer` class.

  The `htmlElementName` argument must be one of the following:
  `ADDRESS`, `BLOCKQUOTE`, `CAPTION`, `CENTER`, `DD`, `DIR`, `DIV`, `DT`, `FIELDSET`, `FORM`, `H1`, `H2`, `H3`, `H4`, `H5`, `H6`, `HR`, `LEGEND`, `LI`, `MENU`, `OL`, `P`, `PRE`, `TR`, `UL`

  Parameters:
    `htmlElementName` - (required) the case insensitive name of a supported HTML block element.
    `topMargin` - the new top margin of the specified element.
  Throws:
    `java.lang.UnsupportedOperationException` - if an unsupported element name is specified.

### getDefaultTopMargin

    public static int getDefaultTopMargin(java.lang.String htmlElementName)

  Returns the default top margin of an HTML block element with the specified name.

  See the `setDefaultTopMargin(String htmlElementName, int topMargin)` method for a full description of this property.

  Parameters:
    `htmlElementName` - (required) the case insensitive name of a supported HTML block element.
  Returns:
    the default top margin of an HTML block element with the specified name.
  Throws:
    `java.lang.UnsupportedOperationException` - if an unsupported element name is specified.

### setDefaultBottomMargin

    public static void setDefaultBottomMargin(java.lang.String htmlElementName,
                                              int bottomMargin)

  Sets the default bottom margin of an HTML block element with the specified name.

  The bottom margin is the number of blank lines that are to be inserted below the rendered block.

  As this is a static method, the setting affects all instances of the `Renderer` class.

  The `htmlElementName` argument must be one of the following:
  `ADDRESS`, `BLOCKQUOTE`, `CAPTION`, `CENTER`, `DD`, `DIR`, `DIV`, `DT`, `FIELDSET`, `FORM`, `H1`, `H2`, `H3`, `H4`, `H5`, `H6`, `HR`, `LEGEND`, `LI`, `MENU`, `OL`, `P`, `PRE`, `TR`, `UL`

  Parameters:
    `htmlElementName` - (required) the case insensitive name of a supported HTML block element.
    `bottomMargin` - the new bottom margin of the specified element.
  Throws:
    `java.lang.UnsupportedOperationException` - if an unsupported element name is specified.

### getDefaultBottomMargin

    public static int getDefaultBottomMargin(java.lang.String htmlElementName)

  Returns the default bottom margin of an HTML block element with the specified name.

  See the `setDefaultBottomMargin(String htmlElementName, int bottomMargin)` method for a full description of this property.

  Parameters:
    `htmlElementName` - (required) the case insensitive name of a supported HTML block element.
  Returns:
    the default bottom margin of an HTML block element with the specified name.
  Throws:
    `java.lang.UnsupportedOperationException` - if an unsupported element name is specified.

### setDefaultIndent

    public static void setDefaultIndent(java.lang.String htmlElementName,
                                        boolean indent)

  Sets the default value of whether an HTML block element of the specified name is indented.

  As this is a static method, the setting affects all instances of the `Renderer` class.

  The `htmlElementName` argument must be one of the following:
  `ADDRESS`, `BLOCKQUOTE`, `CAPTION`, `CENTER`, `DD`, `DIR`, `DIV`, `DT`, `FIELDSET`, `FORM`, `H1`, `H2`, `H3`, `H4`, `H5`, `H6`, `HR`, `LEGEND`, `MENU`, `OL`, `P`, `PRE`, `TR`, `UL`

  Parameters:
    `htmlElementName` - (required) the case insensitive name of a supported HTML block element.
    `indent` - whether the the specified element is indented.
  Throws:
    `java.lang.UnsupportedOperationException` - if an unsupported element name is specified.

### isDefaultIndent

    public static boolean isDefaultIndent(java.lang.String htmlElementName)

  Returns the default value of whether an HTML block element of the specified name is indented.

  See the `setDefaultIndent(String htmlElementName, boolean indent)` method for a full description of this property.

  Parameters:
    `htmlElementName` - (required) the case insensitive name of a supported HTML block element.
  Returns:
    the default value of whether an HTML block element of the specified name is indented.
  Throws:
    `java.lang.UnsupportedOperationException` - if an unsupported element name is specified.

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