diff --git a/README.md b/README.md
index ca05e43..e353125 100644
--- a/README.md
+++ b/README.md
@@ -35,8 +35,10 @@ support for that version for marky-markdown.
 
 For more information on Node.js LTS and support, click [here](https://github.com/nodejs/LTS).
 
+- marky-markdown >= `11.x` supports `4`, `6`, `8`
+- marky-markdown `10.x` supports `4`, `6`
+- marky-markdown `9.x` supports `0.12`, `4`, `6`
 - marky-markdown < `9.0.0` supports `0.10`, `0.12`, `iojs`, `4`, `5`
-- marky-markdown >= `9.0.0` supports `0.12`, `4`, `6`
 
 ## Installation
 
@@ -188,8 +190,6 @@ marky(
 - [lodash](https://github.com/lodash/lodash): A utility library delivering consistency, customization, performance, &amp; extras.
 - [markdown-it](https://github.com/markdown-it/markdown-it): Markdown-it - modern pluggable markdown parser.
 - [markdown-it-emoji](https://github.com/markdown-it/markdown-it-emoji): Markdown-it-emoji extension for Markdown-it that parses markdown emoji syntax to unicode.
-- [markdown-it-expand-tabs](https://github.com/revin/markdown-it-expand-tabs): Replace leading tabs with spaces in fenced code blocks
-- [markdown-it-lazy-headers](https://github.com/Galadirith/markdown-it-lazy-headers): Lazy ATX headers plugin for markdown-it
 - [markdown-it-task-lists](https://github.com/revin/markdown-it-task-lists): Render GitHub-style [task lists](https://github.com/blog/1375-task-lists-in-gfm-issues-pulls-comments)
 - [property-ttl](https://github.com/soldair/property-ttl): Save memory by nulling out a property after ttl if it has not been accessed
 - [sanitize-html](https://github.com/punkave/sanitize-html): Clean up user-submitted HTML, preserving whitelisted elements and whitelisted attributes on a per-element basis
diff --git a/lib/gfm/image.js b/lib/gfm/image.js
deleted file mode 100644
index ac86b39..0000000
--- a/lib/gfm/image.js
+++ /dev/null
@@ -1,179 +0,0 @@
-// CommonMark specifies that images have no whitespace between the alt text and
-// src, e.g.:
-//
-//     ![alt text](path/to/the/image)
-//
-// However, GitHub allows you to put whitespace between the `]` and `(`
-// characters, like so:
-//
-//     ![alt text]    (path/to/the/image)
-//
-// To account for the difference, we need to override markdown-it's image rule.
-// This file is a copy of the original markdown-it source, plus the necessary
-// modifications, wrapped as a markdown-it plugin.
-
-// Process ![image](<src> "title")
-
-'use strict'
-
-module.exports = function (md) {
-  md.inline.ruler.at('image', image)
-}
-
-function image (state, silent) {
-  var attrs
-  var code
-  var content
-  var label
-  var labelEnd
-  var labelStart
-  var pos
-  var ref
-  var res
-  var title
-  var token
-  var tokens
-  var start
-  var href = ''
-  var oldPos = state.pos
-  var max = state.posMax
-  var isSpace = state.md.utils.isSpace
-  var normalizeReference = state.md.utils.normalizeReference
-
-  if (state.src.charCodeAt(state.pos) !== 0x21/* ! */) { return false }
-  if (state.src.charCodeAt(state.pos + 1) !== 0x5B/* [ */) { return false }
-
-  labelStart = state.pos + 2
-  labelEnd = state.md.helpers.parseLinkLabel(state, state.pos + 1, false)
-
-  // parser failed to find ']', so it's not a valid link
-  if (labelEnd < 0) { return false }
-
-  pos = labelEnd + 1
-
-  // BEGIN CUSTOM MODIFICATION
-  // look ahead to see if the next non-whitespace character is '(', and if
-  // it is, skip the whitespace
-  for (; pos < max; pos++) {
-    code = state.src.charCodeAt(pos)
-    if (!isSpace(code) && code !== 0x0A) { break }
-  }
-  if (pos < max && state.src.charCodeAt(pos) !== 0x28) { pos = labelEnd + 1 }
-  // END CUSTOM MODIFICATION
-
-  if (pos < max && state.src.charCodeAt(pos) === 0x28/* ( */) {
-    //
-    // Inline link
-    //
-
-    // [link](  <href>  "title"  )
-    //        ^^ skipping these spaces
-    pos++
-    for (; pos < max; pos++) {
-      code = state.src.charCodeAt(pos)
-      if (!isSpace(code) && code !== 0x0A) { break }
-    }
-    if (pos >= max) { return false }
-
-    // [link](  <href>  "title"  )
-    //          ^^^^^^ parsing link destination
-    start = pos
-    res = state.md.helpers.parseLinkDestination(state.src, pos, state.posMax)
-    if (res.ok) {
-      href = state.md.normalizeLink(res.str)
-      if (state.md.validateLink(href)) {
-        pos = res.pos
-      } else {
-        href = ''
-      }
-    }
-
-    // [link](  <href>  "title"  )
-    //                ^^ skipping these spaces
-    start = pos
-    for (; pos < max; pos++) {
-      code = state.src.charCodeAt(pos)
-      if (!isSpace(code) && code !== 0x0A) { break }
-    }
-
-    // [link](  <href>  "title"  )
-    //                  ^^^^^^^ parsing link title
-    res = state.md.helpers.parseLinkTitle(state.src, pos, state.posMax)
-    if (pos < max && start !== pos && res.ok) {
-      title = res.str
-      pos = res.pos
-
-      // [link](  <href>  "title"  )
-      //                         ^^ skipping these spaces
-      for (; pos < max; pos++) {
-        code = state.src.charCodeAt(pos)
-        if (!isSpace(code) && code !== 0x0A) { break }
-      }
-    } else {
-      title = ''
-    }
-
-    if (pos >= max || state.src.charCodeAt(pos) !== 0x29/* ) */) {
-      state.pos = oldPos
-      return false
-    }
-    pos++
-  } else {
-    //
-    // Link reference
-    //
-    if (typeof state.env.references === 'undefined') { return false }
-
-    if (pos < max && state.src.charCodeAt(pos) === 0x5B/* [ */) {
-      start = pos + 1
-      pos = state.md.helpers.parseLinkLabel(state, pos)
-      if (pos >= 0) {
-        label = state.src.slice(start, pos++)
-      } else {
-        pos = labelEnd + 1
-      }
-    } else {
-      pos = labelEnd + 1
-    }
-
-    // covers label === '' and label === undefined
-    // (collapsed reference link and shortcut reference link respectively)
-    if (!label) { label = state.src.slice(labelStart, labelEnd) }
-
-    ref = state.env.references[normalizeReference(label)]
-    if (!ref) {
-      state.pos = oldPos
-      return false
-    }
-    href = ref.href
-    title = ref.title
-  }
-
-  //
-  // We found the end of the link, and know for a fact it's a valid link;
-  // so all that's left to do is to call tokenizer.
-  //
-  if (!silent) {
-    content = state.src.slice(labelStart, labelEnd)
-
-    state.md.inline.parse(
-      content,
-      state.md,
-      state.env,
-      tokens = []
-    )
-
-    token = state.push('image', 'img', 0)
-    token.attrs = attrs = [ [ 'src', href ], [ 'alt', '' ] ]
-    token.children = tokens
-    token.content = content
-
-    if (title) {
-      attrs.push([ 'title', title ])
-    }
-  }
-
-  state.pos = pos
-  state.posMax = max
-  return true
-}
diff --git a/lib/gfm/indented-headings.js b/lib/gfm/indented-headings.js
deleted file mode 100644
index 88bbdb6..0000000
--- a/lib/gfm/indented-headings.js
+++ /dev/null
@@ -1,35 +0,0 @@
-module.exports = function (md, options) {
-  // Unfortunately, there's no public API for getting access to the existing
-  // installed parsing rules; rather than import the 'heading' rule directly
-  // from markdown-it just so we can wrap it with our own processing, we have to
-  // use internal utility methods to pick it up first, then do the replacement
-  // via normal means.
-  //
-  // This plugin allows us to more closely mimic GitHub's heading parsing. Per
-  // CommonMark, ATX headings are allowed to have one to three spaces before the
-  // hash characters. GitHub doesn't allow any leading whitespace whatsoever.
-  //
-  // For example (the `·` characters represent spaces):
-  //
-  // ·### Renders as H3 in CommonMark
-  // ··## Renders as H2 in CommonMark
-  // ···# Renders as H1 in CommonMark
-  //
-  // ... whereas on GitHub, those become standard paragraphs.
-
-  var ruler = md.block.ruler
-  var originalEntry = ruler.__rules__[ruler.__find__('heading')]
-  var originalRule = originalEntry.fn
-
-  ruler.at('heading', noIndentedHeadings, {alt: originalEntry.alt})
-
-  function noIndentedHeadings (state, startLine, endLine, silent) {
-    // conveniently, state.tShift holds a count of the number of leading spaces
-    // on each line, so all we need to do is return false if it's non-zero
-    if (state.tShift[startLine] > 0) {
-      return false
-    } else {
-      return originalRule.apply(this, arguments)
-    }
-  }
-}
diff --git a/lib/gfm/link.js b/lib/gfm/link.js
deleted file mode 100644
index b33fa3b..0000000
--- a/lib/gfm/link.js
+++ /dev/null
@@ -1,186 +0,0 @@
-// CommonMark specifies that links have no whitespace between the label and
-// destination, e.g.:
-//
-//     [link text](path/to/the/thing)
-//
-// However, GitHub allows you to put whitespace between the `]` and `(`
-// characters, like so:
-//
-//     [link text]    (path/to/the/thing)
-//
-// This is against CommonMark because it's ambiguous. Consider a link reference
-// followed by a parenthetical statement:
-//
-//     [link text] (parenthetical statement)
-//
-//     [link text]: path/to/the/thing
-//
-// CommonMark renders: <a href="path/to/the/thing">link text</a>
-// GitHub renders:     <a href="parenthetical%20statement">link text</a>
-//
-// To account for the difference, we need to override markdown-it's link rule.
-// This file is a copy of the original markdown-it source, plus the necessary
-// modifications, wrapped as a markdown-it plugin.
-
-// Process [link](<to> "stuff")
-'use strict'
-
-module.exports = function (md) {
-  md.inline.ruler.at('link', link)
-}
-
-function link (state, silent) {
-  var attrs
-  var code
-  var label
-  var labelEnd
-  var labelStart
-  var pos
-  var res
-  var ref
-  var title
-  var token
-  var href = ''
-  var oldPos = state.pos
-  var max = state.posMax
-  var start = state.pos
-  var parseReference = true
-  var isSpace = state.md.utils.isSpace
-  var normalizeReference = state.md.utils.normalizeReference
-
-  if (state.src.charCodeAt(state.pos) !== 0x5B/* [ */) { return false }
-
-  labelStart = state.pos + 1
-  labelEnd = state.md.helpers.parseLinkLabel(state, state.pos, true)
-
-  // parser failed to find ']', so it's not a valid link
-  if (labelEnd < 0) { return false }
-
-  pos = labelEnd + 1
-
-  // BEGIN CUSTOM MODIFICATION
-  // look ahead to see if the next non-whitespace character is '(', and if
-  // it is, skip the whitespace
-  for (; pos < max; pos++) {
-    code = state.src.charCodeAt(pos)
-    if (!isSpace(code) && code !== 0x0A) { break }
-  }
-  if (pos < max && state.src.charCodeAt(pos) !== 0x28) { pos = labelEnd + 1 }
-  // END CUSTOM MODIFICATION
-
-  if (pos < max && state.src.charCodeAt(pos) === 0x28/* ( */) {
-    //
-    // Inline link
-    //
-
-    // might have found a valid shortcut link, disable reference parsing
-    parseReference = false
-
-    // [link](  <href>  "title"  )
-    //        ^^ skipping these spaces
-    pos++
-    for (; pos < max; pos++) {
-      code = state.src.charCodeAt(pos)
-      if (!isSpace(code) && code !== 0x0A) { break }
-    }
-    if (pos >= max) { return false }
-
-    // [link](  <href>  "title"  )
-    //          ^^^^^^ parsing link destination
-    start = pos
-    res = state.md.helpers.parseLinkDestination(state.src, pos, state.posMax)
-    if (res.ok) {
-      href = state.md.normalizeLink(res.str)
-      if (state.md.validateLink(href)) {
-        pos = res.pos
-      } else {
-        href = ''
-      }
-    }
-
-    // [link](  <href>  "title"  )
-    //                ^^ skipping these spaces
-    start = pos
-    for (; pos < max; pos++) {
-      code = state.src.charCodeAt(pos)
-      if (!isSpace(code) && code !== 0x0A) { break }
-    }
-
-    // [link](  <href>  "title"  )
-    //                  ^^^^^^^ parsing link title
-    res = state.md.helpers.parseLinkTitle(state.src, pos, state.posMax)
-    if (pos < max && start !== pos && res.ok) {
-      title = res.str
-      pos = res.pos
-
-      // [link](  <href>  "title"  )
-      //                         ^^ skipping these spaces
-      for (; pos < max; pos++) {
-        code = state.src.charCodeAt(pos)
-        if (!isSpace(code) && code !== 0x0A) { break }
-      }
-    } else {
-      title = ''
-    }
-
-    if (pos >= max || state.src.charCodeAt(pos) !== 0x29/* ) */) {
-      // parsing a valid shortcut link failed, fallback to reference
-      parseReference = true
-    }
-    pos++
-  }
-
-  if (parseReference) {
-    //
-    // Link reference
-    //
-    if (typeof state.env.references === 'undefined') { return false }
-
-    if (pos < max && state.src.charCodeAt(pos) === 0x5B/* [ */) {
-      start = pos + 1
-      pos = state.md.helpers.parseLinkLabel(state, pos)
-      if (pos >= 0) {
-        label = state.src.slice(start, pos++)
-      } else {
-        pos = labelEnd + 1
-      }
-    } else {
-      pos = labelEnd + 1
-    }
-
-    // covers label === '' and label === undefined
-    // (collapsed reference link and shortcut reference link respectively)
-    if (!label) { label = state.src.slice(labelStart, labelEnd) }
-
-    ref = state.env.references[normalizeReference(label)]
-    if (!ref) {
-      state.pos = oldPos
-      return false
-    }
-    href = ref.href
-    title = ref.title
-  }
-
-  //
-  // We found the end of the link, and know for a fact it's a valid link;
-  // so all that's left to do is to call tokenizer.
-  //
-  if (!silent) {
-    state.pos = labelStart
-    state.posMax = labelEnd
-
-    token = state.push('link_open', 'a', 1)
-    token.attrs = attrs = [ [ 'href', href ] ]
-    if (title) {
-      attrs.push([ 'title', title ])
-    }
-
-    state.md.inline.tokenize(state)
-
-    token = state.push('link_close', 'a', -1)
-  }
-
-  state.pos = pos
-  state.posMax = max
-  return true
-}
diff --git a/lib/gfm/override-link-destination-parser.js b/lib/gfm/override-link-destination-parser.js
deleted file mode 100644
index 31d8a33..0000000
--- a/lib/gfm/override-link-destination-parser.js
+++ /dev/null
@@ -1,98 +0,0 @@
-// Override the markdown-it helper rule to allow spaces in the src attributes of images and the href attributes of
-// anchor elements:
-//  e.g., ![Gitter](https://badges.gitter.im/Join Chat.svg)
-//
-// This is a modified version of the stock markdown-it helper for parsing link destinations
-'use strict'
-
-function parseLinkDestination (md, str, pos, max) {
-  var code
-  var level
-  var lines = 0
-  var start = pos
-  var result = {
-    ok: false,
-    pos: 0,
-    lines: 0,
-    str: ''
-  }
-  var isSpace = md.utils.isSpace
-  var unescapeAll = md.utils.unescapeAll
-
-  if (str.charCodeAt(pos) === 0x3C /* < */) {
-    pos++
-    while (pos < max) {
-      code = str.charCodeAt(pos)
-      if (code === 0x0A /* \n */ || isSpace(code)) { return result }
-      if (code === 0x3E /* > */) {
-        result.pos = pos + 1
-        result.str = unescapeAll(str.slice(start + 1, pos))
-        result.ok = true
-        return result
-      }
-      if (code === 0x5C /* \ */ && pos + 1 < max) {
-        pos += 2
-        continue
-      }
-
-      pos++
-    }
-
-    // no closing '>'
-    return result
-  }
-
-  // this should be ... } else { ... branch
-
-  level = 0
-  while (pos < max) {
-    code = str.charCodeAt(pos)
-
-    if (code === 0x20) { // space
-      pos++ // 0x22 => double quote, 0x27 => single quote, 0x28 => '(', 0x29 => ')'
-      while (pos < max && code !== 0x22 && code !== 0x27 && code !== 0x28 && code !== 0x29) {
-        code = str.charCodeAt(pos++)
-      }
-      pos--
-      if (pos === max) { // end of the line
-        break
-      }
-      if (code === 0x22 || code === 0x27 || code === 0x28) { // single/double quotes or opening paren for title attributes
-        pos--
-        break
-      }
-    }
-
-    // ascii control characters
-    if (code < 0x20 || code === 0x7F) { break }
-
-    if (code === 0x5C /* \ */ && pos + 1 < max) {
-      pos += 2
-      continue
-    }
-
-    if (code === 0x28 /* ( */) {
-      level++
-      if (level > 1) { break }
-    }
-
-    if (code === 0x29 /* ) */) {
-      level--
-      if (level < 0) { break }
-    }
-
-    pos++
-  }
-
-  if (start === pos) { return result }
-
-  result.str = unescapeAll(str.slice(start, pos))
-  result.lines = lines
-  result.pos = pos
-  result.ok = true
-  return result
-}
-
-module.exports = function (md) {
-  md.helpers.parseLinkDestination = parseLinkDestination.bind(this, md)
-}
diff --git a/lib/gfm/relaxed-link-reference.js b/lib/gfm/relaxed-link-reference.js
deleted file mode 100644
index 7ee9df1..0000000
--- a/lib/gfm/relaxed-link-reference.js
+++ /dev/null
@@ -1,24 +0,0 @@
-module.exports = function (md, options) {
-  // Unfortunately, there's no public API for getting access to the existing
-  // installed parsing rules; rather than import the 'reference' rule directly
-  // from markdown-it just so we can re-install it into the parser with the
-  // 'alt' chain set up correctly, here we're just using internal utility
-  // methods to modify it in place at runtime.
-  //
-  // The net result is that we allow what are known in the CommonMark spec as
-  // "link reference definitions" to interrupt paragraphs, i.e., we relax the
-  // requirement that there be a blank line between a paragraph and a reference
-  // definition.
-  //
-  // That means that this works:
-  //
-  //   Some paragraph text here with a [linkref]
-  //   [linkref]: /actual/link/destination/here
-  //
-  // ...whereas spec compliance requires a blank line between the two.
-
-  var ruler = md.block.ruler
-  var idx = ruler.__find__('reference')
-  ruler.__rules__[idx].alt.push('paragraph')
-  ruler.__compile__()
-}
diff --git a/lib/render.js b/lib/render.js
index cd1dc34..c7cf111 100644
--- a/lib/render.js
+++ b/lib/render.js
@@ -1,8 +1,6 @@
 var pickBy = require('lodash.pickby')
 var MD = require('markdown-it')
-var lazyHeaders = require('markdown-it-lazy-headers')
 var emoji = require('markdown-it-emoji')
-var expandTabs = require('markdown-it-expand-tabs')
 var githubTaskList = require('markdown-it-task-lists')
 
 var cleanup = require('./cleanup')
@@ -16,11 +14,6 @@ var youtube = require('./plugin/youtube')
 var cdnImages = require('./plugin/cdn')
 var packagize = require('./plugin/packagize')
 var htmlHeading = require('./plugin/html-heading')
-var relaxedLinkRefs = require('./gfm/relaxed-link-reference')
-var githubHeadings = require('./gfm/indented-headings')
-var overrideLinkDestinationParser = require('./gfm/override-link-destination-parser')
-var looseLinkParsing = require('./gfm/link')
-var looseImageParsing = require('./gfm/image')
 
 if (typeof process.browser === 'undefined') {
   var Highlights = require('highlights')
@@ -71,21 +64,14 @@ render.getParser = function (options) {
   }
 
   var parser = MD(mdOptions)
-    .use(lazyHeaders)
     .use(emoji, {shortcuts: {}})
-    .use(expandTabs, {tabWidth: 4})
     .use(githubTaskList)
     .use(headingLinks, options)
-    .use(githubHeadings)
-    .use(relaxedLinkRefs)
     .use(gravatar)
     .use(github, {package: options.package})
     .use(youtube)
     .use(packagize, {package: options.package})
     .use(htmlHeading)
-    .use(overrideLinkDestinationParser)
-    .use(looseLinkParsing)
-    .use(looseImageParsing)
 
   if (options.highlightSyntax) parser.use(codeWrap)
   if (options.serveImagesWithCDN) parser.use(cdnImages, {package: options.package})
diff --git a/package-lock.json b/package-lock.json
index e28f7d1..9f90a29 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "marky-markdown",
-  "version": "10.1.4",
+  "version": "11.0.0",
   "lockfileVersion": 1,
   "dependencies": {
     "acorn": {
@@ -2060,11 +2060,6 @@
       "integrity": "sha1-gNZJLcFHCGS79YNTO2UfQqn1JBU=",
       "dev": true
     },
-    "lodash.repeat": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/lodash.repeat/-/lodash.repeat-4.1.0.tgz",
-      "integrity": "sha1-/H3oEx2MisB+S0n3T/6CnR8r7EQ="
-    },
     "lodash.some": {
       "version": "4.6.0",
       "resolved": "https://registry.npmjs.org/lodash.some/-/lodash.some-4.6.0.tgz",
@@ -2123,16 +2118,6 @@
       "resolved": "https://registry.npmjs.org/markdown-it-emoji/-/markdown-it-emoji-1.3.0.tgz",
       "integrity": "sha1-kDrhqZaMPxfU4ULxFdTsV15W0ss="
     },
-    "markdown-it-expand-tabs": {
-      "version": "1.0.12",
-      "resolved": "https://registry.npmjs.org/markdown-it-expand-tabs/-/markdown-it-expand-tabs-1.0.12.tgz",
-      "integrity": "sha1-9UvS8wP4WO5nmMor2D/nAUSBTKA="
-    },
-    "markdown-it-lazy-headers": {
-      "version": "0.1.3",
-      "resolved": "https://registry.npmjs.org/markdown-it-lazy-headers/-/markdown-it-lazy-headers-0.1.3.tgz",
-      "integrity": "sha1-5w3U2nnIepzoLKRwG4t8Di1yKXs="
-    },
     "markdown-it-task-lists": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/markdown-it-task-lists/-/markdown-it-task-lists-2.0.1.tgz",
diff --git a/package.json b/package.json
index 0f800e5..a9d089f 100644
--- a/package.json
+++ b/package.json
@@ -63,8 +63,6 @@
     "lodash.pickby": "^4.2.1",
     "markdown-it": "^8.2.0",
     "markdown-it-emoji": "^1.3.0",
-    "markdown-it-expand-tabs": "^1.0.12",
-    "markdown-it-lazy-headers": "^0.1.3",
     "markdown-it-task-lists": "^2.0.1",
     "property-ttl": "^1.0.0",
     "sanitize-html": "^1.6.1",
diff --git a/test/fixtures/dirty.md b/test/fixtures/dirty.md
index 06e3eb3..638cb0e 100644
--- a/test/fixtures/dirty.md
+++ b/test/fixtures/dirty.md
@@ -14,16 +14,6 @@
 
 ###### h6
 
-<div id="indented">
-
- # indented h1
-
-  ## indented h2
-
-   ### indented h3
-
-</div>
-
 <script charset="utf-8" src="http://malware.com" type="text/javascript">alert("haxorz")</script>
 
 <img src="local.png" width="600" height="400" align="right" valign="middle" onclick="maliciousClickHandler()"></img>
diff --git a/test/fixtures/lazyheading.md b/test/fixtures/lazyheading.md
deleted file mode 100644
index 9432dfa..0000000
--- a/test/fixtures/lazyheading.md
+++ /dev/null
@@ -1,12 +0,0 @@
-
-#lazy heading 1
-
-##lazy heading 2
-
-###lazy heading 3
-
-####lazy heading 4
-
-#####lazy heading 5
-
-######lazy heading 6
diff --git a/test/fixtures/link-ref-relaxed.md b/test/fixtures/link-ref-relaxed.md
deleted file mode 100644
index 81ae619..0000000
--- a/test/fixtures/link-ref-relaxed.md
+++ /dev/null
@@ -1,2 +0,0 @@
-Some paragraph text here with a [linkref]
-[linkref]: /actual/link/here
diff --git a/test/fixtures/link-ref.md b/test/fixtures/link-ref.md
deleted file mode 100644
index c6565f3..0000000
--- a/test/fixtures/link-ref.md
+++ /dev/null
@@ -1,3 +0,0 @@
-Some paragraph text here with a [linkref]
-
-[linkref]: /actual/link/here
diff --git a/test/headings.js b/test/headings.js
index cfdbfb9..c195099 100644
--- a/test/headings.js
+++ b/test/headings.js
@@ -35,16 +35,6 @@ describe('headings', function () {
     })
   })
 
-  it('does not parse indented ATX headings as headings', function () {
-    assert(~fixtures.dirty.indexOf(' # indented h1'))
-    assert(~fixtures.dirty.indexOf('  ## indented h2'))
-    assert(~fixtures.dirty.indexOf('   ### indented h3'))
-    assert.equal($md('#user-content-indented h1').length, 0)
-    assert.equal($md('#user-content-indented h2').length, 0)
-    assert.equal($md('#user-content-indented h3').length, 0)
-    assert.equal($md('#user-content-indented p').length, 3)
-  })
-
   it('injects hashy anchor tags into headings that have DOM ids', function () {
     assert(~fixtures.dirty.indexOf('# h1'))
     assert($md("h1 a[href='#h1']").length)
@@ -192,17 +182,6 @@ describe('headings', function () {
     assert.equal($('h2 a#browser-input-helpers + code').length, 1)
   })
 
-  it('properly handles headings lacking a space between the leading #(s) and heading text', function () {
-    assert(~fixtures.lazyheading.indexOf('#lazy heading'))
-    $ = cheerio.load(marky(fixtures.lazyheading, {prefixHeadingIds: false}))
-    assert.equal($('h1 a#lazy-heading-1').length, 1)
-    assert.equal($('h2 a#lazy-heading-2').length, 1)
-    assert.equal($('h3 a#lazy-heading-3').length, 1)
-    assert.equal($('h4 a#lazy-heading-4').length, 1)
-    assert.equal($('h5 a#lazy-heading-5').length, 1)
-    assert.equal($('h6 a#lazy-heading-6').length, 1)
-  })
-
   it('allows headings to interrupt paragraphs', function () {
     var markdown = 'this is a paragraph\n# Heading text\nSome more text here\nand another line'
     $ = cheerio.load(marky(markdown, {prefixHeadingIds: false}))
diff --git a/test/markdown.js b/test/markdown.js
index 825bb11..ee48c2f 100644
--- a/test/markdown.js
+++ b/test/markdown.js
@@ -17,23 +17,6 @@ describe('markdown processing', function () {
   })
 
   describe('github flavored markdown', function () {
-    it('renders relaxed link reference definitions the same as normal ones', function () {
-      assert(~fixtures['link-ref'].indexOf('[linkref]:'))
-      assert(~fixtures['link-ref-relaxed'].indexOf('[linkref]:'))
-      var $normal = cheerio.load(marky(fixtures['link-ref']))
-      var $relaxed = cheerio.load(marky(fixtures['link-ref-relaxed']))
-      assert($normal('a[href="/actual/link/here"]').length)
-      assert($relaxed('a[href="/actual/link/here"]').length)
-      assert.equal($normal.html(), $relaxed.html())
-    })
-
-    it('converts leading tabs in code blocks to spaces', function () {
-      var $ = cheerio.load(marky(fixtures.basic))
-      var indentHtml = $('.highlight.js .line .comment span:not(.js)').html()
-      assert(!~indentHtml.indexOf('\t'))
-      assert(~indentHtml.indexOf('&#xA0;'))
-    })
-
     it('does not convert text emoticons to unicode', function () {
       assert(~fixtures.github.indexOf(':)'))
       var $ = cheerio.load(marky(fixtures.github))
@@ -115,51 +98,6 @@ describe('markdown processing', function () {
         assert(~tables.indexOf('<td><code>\\|</code></td>'))
       })
     })
-
-    describe('loose link labels', function () {
-      it('still parses link references properly', function () {
-        var markdown = 'a [link] here\n\n[link]: #destination'
-        var $ = cheerio.load(marky(markdown))
-        assert($('a[href="#destination"]').length)
-      })
-
-      it('allows link titles, delimited by \'\', "", or ()', function () {
-        var markdown = 'a [one] and a [two] and a [three]'
-        markdown += '\n\n'
-        markdown += "[one]: #destination 'with a title'\n"
-        markdown += '[two]: #destination "with a title"\n'
-        markdown += '[three]: #destination (with a title)\n'
-        var $ = cheerio.load(marky(markdown))
-        assert.equal($('a').length, 3)
-        assert.equal($('a[title="with a title"]').length, 3)
-      })
-
-      it('allows whitespace between link labels and destinations', function () {
-        var markdown = 'a [link] (#destination) here'
-        var $ = cheerio.load(marky(markdown))
-        assert($('a[href="#destination"]').length)
-      })
-
-      it('allows whitespace between image text and src', function () {
-        var markdown = 'an image: ![alt] (path/to/image)'
-        var $ = cheerio.load(marky(markdown))
-        assert($('img[src="path/to/image"]').length)
-      })
-
-      it('allows whitespace in linked images with whitespace between text and src', function () {
-        var markdown = 'an image: [ ![alt] (path/to/image) ] (path/to/link)'
-        var $ = cheerio.load(marky(markdown))
-        assert($('img[src="path/to/image"]').length)
-        assert($('a[href="path/to/link"]').length)
-      })
-
-      it('allows loose link labels to override link references', function () {
-        var markdown = 'a [link] (or is it) here\n\n[link]: #destination'
-        var $ = cheerio.load(marky(markdown))
-        assert(!$('a[href="#destination"]').length)
-        assert($('a[href="or%20is%20it"]').length)
-      })
-    })
   })
 
   describe('syntax highlighting', function () {
diff --git a/test/sanitize.js b/test/sanitize.js
index 9734197..25d4450 100644
--- a/test/sanitize.js
+++ b/test/sanitize.js
@@ -147,42 +147,6 @@ describe('sanitize', function () {
     assert.equal($('a').attr('title'), title)
   })
 
-  it('allows spaces in path names', function () {
-    // images
-    var $ = cheerio.load(marky('![Gitter](https://badges.gitter.im/Join Chat.svg)'))
-    assert.equal($('img').attr('src'), 'https://badges.gitter.im/Join%20Chat.svg')
-    // anchors
-    $ = cheerio.load(marky('[link text](https://example.com/link me.html)'))
-    assert.equal($('a').attr('href'), 'https://example.com/link%20me.html')
-  })
-
-  it('allows spaces in path names with title attributes', function () {
-    // images
-    var title = 'Image title'
-    var $ = cheerio.load(marky('![Gitter](https://badges.gitter.im/Join Chat.svg "' + title + '")'))
-    assert.equal($('img').attr('src'), 'https://badges.gitter.im/Join%20Chat.svg')
-    assert.equal($('img').attr('title'), title)
-    // anchors
-    title = 'Link title'
-    $ = cheerio.load(marky('[link text](https://example.com/link me.html "' + title + '")'))
-    assert.equal($('a').attr('href'), 'https://example.com/link%20me.html')
-    assert.equal($('a').attr('title'), title)
-  })
-
-  it('allows spaces in path names of images used as anchors', function () {
-    var $ = cheerio.load(marky('[![Gitter](https://badges.gitter.im/Join Chat.svg)](#url)'))
-    assert.equal($('img').attr('src'), 'https://badges.gitter.im/Join%20Chat.svg')
-    assert.equal($('a').attr('href'), '#url')
-  })
-
-  it('allows spaces in path names when inline element is in paragraph', function () {
-    var src = 'I am a paragraph. This is a [link](http://example.com/link me.html).'
-    src += 'And here is an image: ![image](http://example.com/an image.png). This paragraph is now over.'
-    var $ = cheerio.load(marky(src))
-    assert.equal($('img').attr('src'), 'http://example.com/an%20image.png')
-    assert.equal($('a').attr('href'), 'http://example.com/link%20me.html')
-  })
-
   it('allows the <details>/<summary> elements', function () {
     var src = '# Test\n\n<details><summary>Summary here</summary>\nLong long information, War & Peace, etc...</details>\n'
     var $ = cheerio.load(marky(src))