diff --git a/bin/mmmdpp b/bin/mmmdpp
index 5b8bdd3..289a349 100755
--- a/bin/mmmdpp
+++ b/bin/mmmdpp
@@ -134,6 +134,11 @@ parser = OptionParser.new do |opts|
     options[:include].append(inc)
   end
 
+  opts.on("-e", "--extension [STRING]", String,
+          "Enable extension") do |inc|
+    options[:include].append("#{__dir__}/../lib/mmmd/extensions/#{inc}.rb")
+  end
+
   opts.on("-o", "--option [STRING]", String,
           "Add option string. Can be repeated. Format: <key>: <JSON value>\n"\
           "<key>: (<\"string\">|<symbol>|<[integer]>)"\
diff --git a/lib/mmmd/blankshell.rb b/lib/mmmd/blankshell.rb
index d47a4a5..8406e80 100644
--- a/lib/mmmd/blankshell.rb
+++ b/lib/mmmd/blankshell.rb
@@ -215,7 +215,7 @@ module PointBlank
           while line && (status, line = try_open(line)) && status; end
         end
         close_up(0)
-        @stack.first
+        finalize_root(@stack.first)
       end
 
       private
@@ -273,12 +273,39 @@ module PointBlank
           switch = x.parser.close(x)
           x.parser = nil
           x = transfer(x, switch) if switch
-          x.parse_inner if x.respond_to? :parse_inner
+          prepare_conversion(x)
         end
         @topdepth = @depth = level
         @stack = @stack[..level]
       end
 
+      # Prepare element for conversion
+      def prepare_conversion(block)
+        block.root.append_temp_child(block) if block.class.conversion
+      end
+
+      # Finalize conversion
+      # This has to be done after the document gets processed due to
+      # the way link definitions have to be handled.
+      def finalize_root(root)
+        parse_inner = lambda do |block|
+          child = block.class.conversion.new
+          child.parent = block.parent
+          child.content = block.content.strip
+          if block.class.conversion_literal
+            block.append_child(child)
+          else
+            scanner = ::PointBlank::Parsing::StackScanner.new(child)
+            scanner.scan
+            child.each { |c| block.append_child(c) }
+          end
+          block.content = ""
+        end
+        root.temp_children.each { |block| parse_inner.call(block) }
+        root.temp_children.clear
+        root
+      end
+
       # Transfer data from class to another class (morph class)
       def transfer(block, switchclass)
         newblock = switchclass.new
@@ -1496,6 +1523,8 @@ module PointBlank
           subclass.parser ||= @parser
           subclass.scanner ||= @scanner
           subclass.unsorted_children ||= @unsorted_children.dup || []
+          subclass.conversion ||= @conversion
+          subclass.conversion_literal ||= @conversion_literal
           super(subclass)
         end
 
@@ -1539,6 +1568,14 @@ module PointBlank
           @unsorted_overlays.append([overlay, priority])
         end
 
+        # Define a conversion class that takes place in transition
+        # from block mode to inline mode
+        # @param conversion [Class]
+        def define_conversion(cls, literal: false)
+          @conversion = cls
+          @conversion_literal = literal
+        end
+
         # Sort overlays by priority
         # @return [void]
         def sort_overlays
@@ -1556,12 +1593,29 @@ module PointBlank
         end
 
         # Source parameters from parent (fixes recursive dependency)
-        def upsource
+        def upsource(overwrite: false)
           superclass&.tap do |sc|
-            @scanner = sc.scanner
-            @parser = sc.parser
-            @unsorted_children = sc.unsorted_children.dup
-            @unsorted_overlays = sc.unsorted_overlays.dup
+            if overwrite then
+              @scanner = sc.scanner
+              @parser = sc.parser
+              @unsorted_children = sc.unsorted_children.dup
+              @unsorted_overlays = sc.unsorted_overlays.dup
+              @conversion = sc.conversion
+              @conversion_literal = sc.conversion_literal
+            else
+              @scanner ||= sc.scanner
+              @parser ||= sc.parser
+              if sc.unsorted_overlays
+                @unsorted_overlays = (@unsorted_overlays || []) + sc.unsorted_overlays
+              end
+              if sc.unsorted_children
+                @unsorted_children = (@unsorted_children || []) + sc.unsorted_children
+              end
+              @conversion ||= sc.conversion
+              if @conversion_literal.nil?
+                @conversion_literal = sc.conversion_literal
+              end
+            end
           end
           sort_children
         end
@@ -1582,7 +1636,8 @@ module PointBlank
 
         attr_accessor :scanner, :parser,
                       :unsorted_children,
-                      :unsorted_overlays
+                      :unsorted_overlays,
+                      :conversion, :conversion_literal
       end
 
       include ::Enumerable
@@ -1659,31 +1714,31 @@ module PointBlank
     class TempText < DOMObject
     end
 
+    # Infline formattable text
+    class InlineElement < DOMObject
+    end
+
     # Inline text
-    class Text < DOMObject
+    class Text < InlineElement
     end
 
     # Inline preformatted text
-    class InlinePre < DOMObject
+    class InlinePre < InlineElement
       define_parser ::PointBlank::Parsing::CodeInline
     end
 
     # Hard Linebreak
-    class InlineBreak < DOMObject
+    class InlineBreak < InlineElement
       define_parser ::PointBlank::Parsing::HardBreakInline
     end
 
     # Autolink
-    class InlineAutolink < DOMObject
+    class InlineAutolink < InlineElement
       define_parser ::PointBlank::Parsing::AutolinkInline
     end
 
-    # Infline formattable text
-    class InlineFormattable < DOMObject
-    end
-
     # Image
-    class InlineImage < InlineFormattable
+    class InlineImage < InlineElement
       define_parser ::PointBlank::Parsing::ImageInline
       define_child ::PointBlank::DOM::InlinePre, 4000
       define_child ::PointBlank::DOM::InlineBreak, 9999
@@ -1692,7 +1747,7 @@ module PointBlank
     end
 
     # Hyperreferenced text
-    class InlineLink < InlineFormattable
+    class InlineLink < InlineElement
       define_parser ::PointBlank::Parsing::LinkInline
       define_child ::PointBlank::DOM::InlinePre, 4000
       define_child ::PointBlank::DOM::InlineImage, 5000
@@ -1749,43 +1804,16 @@ module PointBlank
 
     # Leaf block (virtual)
     class LeafBlock < DOMObject
-      # Virtual hook to delay inline processing
-      def parse_inner
-        self.content = content.strip if content
-        root.append_temp_child(self)
-      end
+      define_conversion ::PointBlank::DOM::InlineRoot
     end
 
     # Leaf literal block (virtual)
     class LeafLiteralBlock < LeafBlock
-      # Virtual hook to push inlines in place of leaf blocks
-      def parse_inner
-        child = ::PointBlank::DOM::Text.new
-        child.content = content
-        append_child(child)
-      end
+      define_conversion ::PointBlank::DOM::Text, literal: true
     end
 
     # Document root
     class Document < Block
-      # (see ::PointBlank::DOM::DOMObject#parse)
-      def self.parse(doc)
-        output = super(doc)
-        # This has to be done after the document gets processed due to the way link
-        # definitions have to be handled.
-        parse_inner = lambda do |block|
-          child = ::PointBlank::DOM::InlineRoot.new
-          child.parent = block.parent
-          child.content = block.content
-          scanner = ::PointBlank::Parsing::StackScanner.new(child)
-          scanner.scan
-          block.content = ""
-          child.each { |c| block.append_child(c) }
-        end
-        output.temp_children.each { |block| parse_inner.call(block) }
-        output.temp_children.clear
-        output
-      end
     end
 
     # Paragraph in a document (separated by 2 newlines)
@@ -1793,12 +1821,7 @@ module PointBlank
       define_parser ::PointBlank::Parsing::ParagraphParser
       define_overlay ::PointBlank::Parsing::ParagraphUnderlineOverlay, 0
       define_overlay ::PointBlank::Parsing::LinkReferenceOverlay
-
-      # Virtual hook to delay inline processing
-      def parse_inner
-        self.content = content.strip if content
-        root.append_temp_child(self)
-      end
+      define_conversion ::PointBlank::DOM::InlineRoot
     end
 
     # Heading level 1
diff --git a/lib/mmmd/extensions/tables.rb b/lib/mmmd/extensions/tables.rb
new file mode 100644
index 0000000..0a9756d
--- /dev/null
+++ b/lib/mmmd/extensions/tables.rb
@@ -0,0 +1,355 @@
+# frozen_string_literal: true
+
+require_relative '../blankshell'
+
+module PointBlank
+  module Parsing
+    # Table overlay
+    class TableParser < ::PointBlank::Parsing::NullParser
+      # (see ::PointBlank::Parsing::NullParser#begin?)
+      def self.begin?(line)
+        check_line(line) && !check_separator(line)
+      end
+
+      # Check that a line is a separator
+      # @param line [String]
+      # @return [Boolean]
+      def self.check_separator(line)
+        line.split("|")
+            .reject { |p| p.strip.empty? }
+            .all? { |p| p.strip.match?(/^:?(?:---+|===+):?$/) }
+      end
+
+      # Check that a line is an actual table line
+      # @param line [String]
+      # @return [Boolean]
+      def self.check_line(line)
+        line.match?(/^\A {0,3}\S/) &&
+          find_unescaped(line, "|") &&
+          line.match?(/[^|]+\|/)
+      end
+
+      # Find the first occurence of an unescaped pattern
+      # @param string [String]
+      # @param pattern [Regexp, String]
+      # @return [Integer, nil]
+      def self.find_unescaped(string, pattern)
+        initial = 0
+        while (index = string.index(pattern, initial))
+          return index if check_unescaped(index, string)
+
+          initial = index + 1
+        end
+        nil
+      end
+
+      # Check that the symbol at this index is not escaped
+      # @param index [Integer]
+      # @param string [String]
+      # @return [nil, Integer]
+      def self.check_unescaped(index, string)
+        return index if index.zero?
+
+        count = 0
+        index -= 1
+        while index >= 0 && string[index] == "\\"
+          count += 1
+          index -= 1
+        end
+        (count % 2).zero?
+      end
+
+      # (see ::PointBlank::Parsing::NullParser#close)
+      def close(block, lazy: false)
+        return ::PointBlank::DOM::Paragraph unless @correct
+
+        nil
+      end
+
+      # (see ::PointBlank::Parsing::NullParser#consume)
+      def consume(line, _parent = nil, lazy: false)
+        return [nil, nil] if lazy
+        return [nil, nil] unless check_line(line)
+
+        unless @attempted
+          @enclosed = true if line.match?(/^\s*\|.+?\|\s*$/)
+          @attempted = true
+        end
+        @correct ||= check_separator(line)
+        [line, nil]
+      end
+
+      attr_reader :enclosed
+
+      private
+
+      def check_separator(line)
+        line.split("|")
+            .reject { |p| p.strip.empty? }
+            .all? { |p| p.strip.match?(/^:?===+:?$/) }
+      end
+
+      def check_line(line)
+        !self.class.find_unescaped(line, "|").nil? &&
+          line.match?(/[^|]+\|/)
+      end
+    end
+
+    # Table row
+    class TableRowParser < ::PointBlank::Parsing::NullParser
+      # (see ::PointBlank::Parsing::NullParser#begin?)
+      def self.begin?(line)
+        check_line(line) && !check_separator(line)
+      end
+
+      # Check that a line is a separator
+      # @param line [String]
+      # @return [Boolean]
+      def self.check_separator(line)
+        line.split("|")
+            .reject { |p| p.strip.empty? }
+            .all? { |p| p.strip.match?(/^:?(?:---+|===+):?$/) }
+      end
+
+      # Check that a line is an actual table line
+      # @param line [String]
+      # @return [Boolean]
+      def self.check_line(line)
+        line.match?(/^\A {0,3}\S/) &&
+          find_unescaped(line, "|") &&
+          line.match?(/[^|]+\|/)
+      end
+
+      # Find the first occurence of an unescaped pattern
+      # @param string [String]
+      # @param pattern [Regexp, String]
+      # @return [Integer, nil]
+      def self.find_unescaped(string, pattern)
+        initial = 0
+        while (index = string.index(pattern, initial))
+          return index if check_unescaped(index, string)
+
+          initial = index + 1
+        end
+        nil
+      end
+
+      # Check that the symbol at this index is not escaped
+      # @param index [Integer]
+      # @param string [String]
+      # @return [nil, Integer]
+      def self.check_unescaped(index, string)
+        return index if index.zero?
+
+        count = 0
+        index -= 1
+        while index >= 0 && string[index] == "\\"
+          count += 1
+          index -= 1
+        end
+        (count % 2).zero?
+      end
+
+      def consume(line, parent = nil, lazy: false)
+        line = line.gsub(/[\\\s]+$/, '')
+        if parent.parser.enclosed
+          line = line
+                 .strip
+                 .delete_prefix("|")
+                 .delete_suffix("|")
+        end
+
+        return [nil, nil] if @consumed && !check_separator(line)
+
+        @consumed = check_header(line) || check_separator(line)
+        push("|#{line}|\n")
+        [line, nil]
+      end
+
+      private
+
+      def check_separator(line)
+        line.split("|")
+            .reject { |p| p.strip.empty? }
+            .all? { |p| p.strip.match?(/^:?---+:?$/) }
+      end
+
+      def check_header(line)
+        line.split("|")
+            .reject { |p| p.strip.empty? }
+            .all? { |p| p.strip.match?(/^:?===+:?$/) }
+      end
+
+      def check_line(line)
+        !self.class.find_unescaped(line, "|").nil? &&
+          line.match?(/[^|]+\|/)
+      end
+    end
+
+    # Table Row overlay (decides the type of row used)
+    class TableRowOverlay < NullOverlay
+      # (see ::PointBlank::Parsing::NullOverlay#tokenize)
+      def process(block, lazy: false)
+        output = check_underlines(block.content.lines.last)
+        block.content = block.content.lines[0..-2].join("")
+        output
+      end
+
+      private
+
+      # Check which type of row this particular row should be
+      def check_underlines(line)
+        if check_header(line)
+          ::PointBlank::DOM::TableHeaderRow
+        else
+          ::PointBlank::DOM::TableRow
+        end
+      end
+
+      # Check if the line is a header
+      def check_header(line)
+        line.split("|")
+            .reject { |p| p.strip.empty? }
+            .all? { |p| p.strip.match?(/^:?===+:?$/) }
+      end
+    end
+
+    # Table column separator
+    class TableColumnInline < NullInline
+      # (see ::PointBlank::Parsing::NullInline#tokenize)
+      def self.tokenize(string, *_lookaround)
+        iterate_tokens(string, /[|\n]/) do |_before, text, matched|
+          next text unless matched
+
+          sym = text[0]
+          [sym, self, sym == '|' ? :open : :wrap]
+        end
+      end
+
+      # (see ::PointBlank::Parsing::NullInline#forward_walk)
+      def self.forward_walk(parts)
+        buffer = []
+        current = []
+        bin_idx = 0
+        skip_first = true
+        parts.each_with_index do |part, idx|
+          next current.append(part) unless part.is_a?(Array) &&
+                                           part[1] == self
+          next (skip_first = false) if skip_first
+
+          if part.last == :open
+            buffer.append([]) if buffer.length < bin_idx + 1
+            buffer[bin_idx] += current + ["\n"]
+            bin_idx += 1
+          else
+            bin_idx = 0
+            skip_first = true
+          end
+          current = []
+        end
+        [build(merge_lines(buffer.first)),
+         buffer[1..].map { |x| build(merge_lines(x)) }]
+      end
+
+      # Merge line runs so that the content looks correct
+      # @param current [Array<String, Array>]
+      def self.merge_lines(current)
+        result = []
+        current.each do |part|
+          next result.append(part) unless part.is_a? String
+
+          if result.last.is_a? String
+            result[-1] += part.lstrip.gsub(/ +\n?/," ")
+          else
+            result.append(part.lstrip.gsub(/ +\n?/," "))
+          end
+        end
+        result[-1] = result.last.rstrip if result.last.is_a? String
+        result
+      end
+    end
+
+    # Header row table column separator
+    # (exists because of a bug in handling parser_for)
+    class TableHeaderColumnInline < TableColumnInline
+    end
+  end
+
+  module DOM
+    # Table column
+    class TableColumn < ::PointBlank::DOM::InlineElement
+      define_parser ::PointBlank::Parsing::TableColumnInline
+    end
+
+    # Table column root (virtual)
+    class TableColumnRoot < ::PointBlank::DOM::InlineRoot
+      define_scanner ::PointBlank::Parsing::StackScanner
+      define_child TableColumn
+    end
+
+    # Table column
+    class TableHeaderColumn < ::PointBlank::DOM::InlineElement
+      define_parser ::PointBlank::Parsing::TableHeaderColumnInline
+    end
+
+    # Table header column root (virtual)
+    class TableHeaderColumnRoot < ::PointBlank::DOM::InlineRoot
+      define_scanner ::PointBlank::Parsing::StackScanner
+      define_child TableHeaderColumn
+    end
+
+    # Table header row
+    class TableHeaderRow < ::PointBlank::DOM::DOMObject
+      define_parser ::PointBlank::Parsing::TableRowParser
+      define_conversion ::PointBlank::DOM::TableHeaderColumnRoot
+    end
+
+    # Table row
+    class TableRow < ::PointBlank::DOM::DOMObject
+      define_parser ::PointBlank::Parsing::TableRowParser
+      define_overlay ::PointBlank::Parsing::TableRowOverlay
+      define_conversion ::PointBlank::DOM::TableColumnRoot
+    end
+
+    # Table
+    class Table < ::PointBlank::DOM::DOMObject
+      define_parser ::PointBlank::Parsing::TableParser
+      define_child ::PointBlank::DOM::TableRow, 300
+      define_child ::PointBlank::DOM::TableHeaderRow
+    end
+
+    # Document extension
+    ::PointBlank::DOM::Block.class_eval do
+      define_child ::PointBlank::DOM::Table, 1500
+    end
+
+    Block.subclasses.map(&:upsource)
+  end
+end
+
+# Touch to do autoloading
+MMMD::Renderers::HTML.yield_self
+
+module MMMD
+  module Renderers
+    module HTMLConstants
+      if defined? MapManager
+        MapManager.define_mapping "PointBlank::DOM::Table", {
+          tag: "table"
+        }
+        MapManager.define_mapping "PointBlank::DOM::TableRow", {
+          tag: "tr"
+        }
+        MapManager.define_mapping "PointBlank::DOM::TableHeaderRow", {
+          tag: "tr"
+        }
+        MapManager.define_mapping "PointBlank::DOM::TableColumn", {
+          tag: "td"
+        }
+        MapManager.define_mapping "PointBlank::DOM::TableHeaderColumn", {
+          tag: "th"
+        }
+      end
+    end
+  end
+end
diff --git a/lib/mmmd/renderers/html.rb b/lib/mmmd/renderers/html.rb
index 45f4ab9..d7b5314 100644
--- a/lib/mmmd/renderers/html.rb
+++ b/lib/mmmd/renderers/html.rb
@@ -232,7 +232,7 @@ module MMMD
       end
 
       def _render(element, options, inline: false, level: 0, literaltext: false)
-        modeswitch = figure_out_modeswitch(element)
+        modeswitch = figure_out_modeswitch(element) unless inline
         inline ||= modeswitch
         level += 1 unless inline
         text = if element.children.empty?
@@ -255,7 +255,8 @@ module MMMD
 
       def figure_out_modeswitch(element)
         element.is_a?(::PointBlank::DOM::LeafBlock) ||
-          element.is_a?(::PointBlank::DOM::Paragraph)
+          element.is_a?(::PointBlank::DOM::Paragraph) ||
+          element.is_a?(::PointBlank::DOM::InlineElement)
       end
 
       def run_filters(text, element, level:, inline:, modeswitch:,