diff --git a/news/changelog-1.4.md b/news/changelog-1.4.md
index bea3587246..409e17bdb5 100644
--- a/news/changelog-1.4.md
+++ b/news/changelog-1.4.md
@@ -91,7 +91,6 @@
 - ([#5969](https://github.com/quarto-dev/quarto-cli/issues/5969)): Correctly detect a required rerun for biblatex when using backref link options.
 - ([#5690](https://github.com/quarto-dev/quarto-cli/issues/5690)): Improve validation of `pdf-engine`
 - ([#6077](https://github.com/quarto-dev/quarto-cli/issues/6077)): Make sure proof environments are tight around contents.
-- ([#6298](https://github.com/quarto-dev/quarto-cli/issues/6298)): Handle multiple margin and caption specifiers on a single image.
 - ([#6907](https://github.com/quarto-dev/quarto-cli/issues/6907)): Fix issue with footnote mark line processor not triggering.
 - ([#6990](https://github.com/quarto-dev/quarto-cli/issues/6990)): Fix an issue where underscore in `filename` code cell attribute were not escaped.
 - ([#7175](https://github.com/quarto-dev/quarto-cli/issues/7175)): Fix an issue with code annotations when more than one digit is used for annotation number.
diff --git a/src/project/project-config.ts b/src/project/project-config.ts
index a80940b1d7..02f0f82675 100644
--- a/src/project/project-config.ts
+++ b/src/project/project-config.ts
@@ -1,8 +1,9 @@
 /*
- * project-config.ts
- *
- * Copyright (C) 2020-2022 Posit Software, PBC
- */
+* project-config.ts
+*
+* Copyright (C) 2020-2022 Posit Software, PBC
+*
+*/
 
 import { join } from "path/mod.ts";
 
@@ -16,34 +17,28 @@ import { SidebarItem } from "./types.ts";
 
 export type SidebarContext = {
   counter: number;
-  itemCounter: number;
 };
 
 export const sidebarContext = (): SidebarContext => {
-  return { counter: 0, itemCounter: 0 };
+  return { counter: 0 };
 };
 
 export function normalizeSidebarItem(
   projectDir: string,
   item: SidebarItem,
-  context: SidebarContext,
+  context: { counter: number },
 ): SidebarItem {
   // clone so we can mutate
   item = ld.cloneDeep(item);
 
-  if (typeof item === "string") {
-    context.itemCounter = context.itemCounter + 1;
-    const id = `${kQuartoSidebarItemPrefix}${context.itemCounter}`;
-
+  if (typeof (item) === "string") {
     if (safeExistsSync(join(projectDir, item))) {
       item = {
         href: item,
-        id,
       };
     } else {
       item = {
         text: item,
-        id,
       };
     }
   } else {
@@ -72,11 +67,6 @@ export function normalizeSidebarItem(
       // If this is a section, we should insist that it have 'contents'
       // even if they are empty.
       item.contents = item.contents || [];
-    } else {
-      context.itemCounter = context.itemCounter + 1;
-      item.id = item.id === undefined
-        ? `${kQuartoSidebarItemPrefix}${context.itemCounter}`
-        : item.id;
     }
 
     // handle subitems
@@ -95,7 +85,6 @@ export function normalizeSidebarItem(
 }
 
 const kQuartoSidebarPrefix = "quarto-sidebar-section-";
-const kQuartoSidebarItemPrefix = "quarto-sidebar-item-";
 
 export function resolveHrefAttribute(
   item: { href?: string; file?: string; url?: string },
diff --git a/src/project/types/website/website-navigation-md.ts b/src/project/types/website/website-navigation-md.ts
index 8b5f81eb6d..4985f29d63 100644
--- a/src/project/types/website/website-navigation-md.ts
+++ b/src/project/types/website/website-navigation-md.ts
@@ -243,7 +243,7 @@ const sidebarContentsHandler = (context: NavigationPipelineContext) => {
             if (item.sectionId) {
               markdown[`${kSidebarIdPrefix}${item.sectionId}`] = item.text;
             } else {
-              markdown[`${kSidebarIdPrefix}${item.id || ""}${item.href}`] =
+              markdown[`${kSidebarIdPrefix}${item.href}${item.text}`] =
                 item.text;
             }
           }
@@ -258,11 +258,11 @@ const sidebarContentsHandler = (context: NavigationPipelineContext) => {
       );
       for (let i = 0; i < sidebarItemEls.length; i++) {
         const sidebarEl = sidebarItemEls[i] as Element;
-        const link = sidebarEl.querySelector(".menu-text");
         const href = sidebarEl.getAttribute("href");
+        const link = sidebarEl.querySelector(".menu-text");
         if (link) {
           const sidebarText =
-            rendered[`${kSidebarIdPrefix}${sidebarEl.id}${href}`];
+            rendered[`${kSidebarIdPrefix}${href}${link.innerText}`];
           if (sidebarText) {
             link.innerHTML = sidebarText.innerHTML;
           }
diff --git a/src/project/types/website/website-navigation.ts b/src/project/types/website/website-navigation.ts
index 163fb2de8a..241ed3cbfe 100644
--- a/src/project/types/website/website-navigation.ts
+++ b/src/project/types/website/website-navigation.ts
@@ -75,7 +75,6 @@ import {
 import {
   normalizeSidebarItem,
   resolveHrefAttribute,
-  SidebarContext,
   sidebarContext,
 } from "../../project-config.ts";
 import { projectType } from "../project-types.ts";
@@ -1058,10 +1057,7 @@ async function resolveSidebarItems(
   }
 }
 
-async function resolveSidebarItem(
-  project: ProjectContext,
-  item: SidebarItem,
-) {
+async function resolveSidebarItem(project: ProjectContext, item: SidebarItem) {
   if (item.href) {
     item = await resolveItem(
       project,
diff --git a/src/resources/filters/common/theorems.lua b/src/resources/filters/common/theorems.lua
index 49ff6d173d..a88eb355a5 100644
--- a/src/resources/filters/common/theorems.lua
+++ b/src/resources/filters/common/theorems.lua
@@ -1,27 +1,2 @@
 -- theorems.lua
 -- Copyright (C) 2020-2022 Posit Software, PBC
-
-proofTypes = {
-  proof =  {
-    env = 'proof',
-    title = 'Proof'
-  },
-  remark =  {
-    env = 'remark',
-    title = 'Remark'
-  },
-  solution = {
-    env = 'solution',
-    title = 'Solution'
-  }
-}
-
-function proofType(el)
-  local type = el.attr.classes:find_if(function(clz) return proofTypes[clz] ~= nil end)
-  if type ~= nil then
-    return proofTypes[type]
-  else
-    return nil
-  end
-
-end
\ No newline at end of file
diff --git a/src/resources/filters/crossref/crossref.lua b/src/resources/filters/crossref/crossref.lua
index 1ea56d0acf..e97d3cdcb7 100644
--- a/src/resources/filters/crossref/crossref.lua
+++ b/src/resources/filters/crossref/crossref.lua
@@ -97,6 +97,7 @@ import("../quarto-pre/panel-input.lua")
 import("../quarto-pre/panel-layout.lua")
 import("../quarto-pre/panel-sidebar.lua")
 import("../quarto-pre/parsefiguredivs.lua")
+import("../quarto-pre/parseblockreftargets.lua")
 import("../quarto-pre/project-paths.lua")
 import("../quarto-pre/resourcefiles.lua")
 import("../quarto-pre/results.lua")
@@ -117,6 +118,7 @@ import("../customnodes/decoratedcodeblock.lua")
 import("../customnodes/callout.lua")
 import("../customnodes/panel-tabset.lua")
 import("../customnodes/floatreftarget.lua")
+import("../customnodes/proof.lua")
 import("../customnodes/theorem.lua")
 import("../customnodes/panellayout.lua")
 
@@ -176,7 +178,8 @@ local quarto_normalize_filters = {
     name = "normalize-combine-2", 
     filter = combineFilters({
       parse_md_in_html_rawblocks(),
-      parse_reftargets(),
+      parse_floatreftargets(),
+      parse_blockreftargets(),
     }),
   },
 }
diff --git a/src/resources/filters/crossref/theorems.lua b/src/resources/filters/crossref/theorems.lua
index 7899ed0ea8..a006ad0905 100644
--- a/src/resources/filters/crossref/theorems.lua
+++ b/src/resources/filters/crossref/theorems.lua
@@ -3,11 +3,10 @@
 
 -- preprocess theorem to ensure that embedded headings are unnumered
 function crossref_preprocess_theorems()
-  local types = theorem_types
   return {
     Div = function(el)
       local type = refType(el.attr.identifier)
-      if types[type] ~= nil or proofType(el) ~= nil then
+      if theorem_types[type] ~= nil or proof_type(el) ~= nil then
         return _quarto.ast.walk(el, {
           Header = function(el)
             el.classes:insert("unnumbered")
@@ -15,15 +14,11 @@ function crossref_preprocess_theorems()
           end
         })
       end
-
     end
   }
 end
 
 function crossref_theorems()
-
-  local types = theorem_types
-
   return {
     Theorem = function(thm)
       local label = thm.identifier
@@ -32,19 +27,29 @@ function crossref_theorems()
       thm.order = add_crossref(label, type, title)
       return thm
     end,
+    Proof = function(proof)
+      local label = proof.identifier
+      if label == "" then
+        return nil -- it's an unnumbered proof
+      end
+      local type = refType(label)
+      local title = quarto.utils.as_blocks(proof.name)
+      proof.order = add_crossref(label, type, title)
+      return proof
+    end,
     Div = function(el)
 
       local type = refType(el.attr.identifier)
-      local theoremType = types[type]
+      local theoremType = theorem_types[type]
       if theoremType then
         internal_error()
       else
         -- see if this is a proof, remark, or solution
-        local proof = proofType(el)
+        local proof = proof_type(el)
         if proof ~= nil then
 
           -- ensure requisite latex is injected
-          crossref.usingTheorems = true
+          crossref.using_theorems = true
 
           if proof.env ~= "proof" then
             el.attr.classes:insert("proof")
@@ -135,7 +140,7 @@ function jatsTheorem(el, label, title)
   --   </p>
   -- </statement> 
 
-  if title then
+  if #title > 0 then
     tprepend(el.content, {
       pandoc.RawBlock("jats", "<title>"),  
       pandoc.Plain(title), 
@@ -179,19 +184,17 @@ end
 function theoremLatexIncludes()
   
   -- determine which theorem types we are using
-  local types = theorem_types
-  local refs = tkeys(crossref.index.entries)
-  local usingTheorems = crossref.usingTheorems
+  local using_theorems = crossref.using_theorems
   for k,v in pairs(crossref.index.entries) do
     local type = refType(k)
-    if types[type] then
-      usingTheorems = true
-      types[type].active = true
+    if theorem_types[type] then
+      using_theorems = true
+      theorem_types[type].active = true
     end
   end
   
   -- return requisite latex if we are using theorems
-  if usingTheorems then
+  if using_theorems then
     local secType 
     if crossrefOption("chapters", false) then 
       secType = "chapter" 
@@ -199,19 +202,22 @@ function theoremLatexIncludes()
       secType = "section" 
     end
     local theoremIncludes = "\\usepackage{amsthm}\n"
-    for _, type in ipairs(tkeys(types)) do
-      if types[type].active then
+    for _, type in ipairs(tkeys(theorem_types)) do
+      if theorem_types[type].active then
         theoremIncludes = theoremIncludes .. 
-          "\\theoremstyle{" .. types[type].style .. "}\n" ..
-          "\\newtheorem{" .. types[type].env .. "}{" .. 
-          titleString(type, types[type].title) .. "}[" .. secType .. "]\n"
+          "\\theoremstyle{" .. theorem_types[type].style .. "}\n" ..
+          "\\newtheorem{" .. theorem_types[type].env .. "}{" .. 
+          titleString(type, theorem_types[type].title) .. "}[" .. secType .. "]\n"
       end
     end
     theoremIncludes = theoremIncludes ..
       "\\theoremstyle{remark}\n" ..
       "\\AtBeginDocument{\\renewcommand*{\\proofname}{" .. envTitle("proof", "Proof") .. "}}\n" ..
       "\\newtheorem*{remark}{" .. envTitle("remark", "Remark") .. "}\n" ..
-      "\\newtheorem*{solution}{" .. envTitle("solution", "Solution") .. "}\n"
+      "\\newtheorem*{solution}{" .. envTitle("solution", "Solution") .. "}\n" ..
+      "\\newtheorem{refremark}{" .. envTitle("remark", "Remark") .. "}[" .. secType .. "]\n" ..
+      "\\newtheorem{refsolution}{" .. envTitle("solution", "Solution") .. "}[" .. secType .. "]\n"
+
     return theoremIncludes
   else
     return nil
diff --git a/src/resources/filters/customnodes/floatreftarget.lua b/src/resources/filters/customnodes/floatreftarget.lua
index 25f11deadd..483e35886a 100644
--- a/src/resources/filters/customnodes/floatreftarget.lua
+++ b/src/resources/filters/customnodes/floatreftarget.lua
@@ -363,7 +363,7 @@ end, function(float)
   -- do the longtable fixups below
   float.content = _quarto.ast.walk(quarto.utils.as_blocks(float.content), {
     Table = function(tbl)
-      return pandoc.RawBlock("latex-merge", pandoc.write(pandoc.Pandoc({tbl}), "latex"))
+      return pandoc.RawBlock("latex", pandoc.write(pandoc.Pandoc({tbl}), "latex"))
     end
   })
 
@@ -371,33 +371,12 @@ end, function(float)
     local raw
     -- have to call as_blocks() again here because assigning to float.content
     -- goes through our AST metaclasses which coalesce a singleton list to a single AST element
-    float.content = _quarto.ast.walk(quarto.utils.as_blocks(float.content), {
-      -- coalesce rawblocks ahead of table fixups
-      Blocks = function(blocks)
-        local result = pandoc.Blocks({})
-        local prev
-        for _,block in ipairs(blocks) do
-          if prev == nil then
-            prev = block
-          elseif prev.t == "RawBlock" and block.t == "RawBlock" and prev.format == block.format then
-            prev.text = prev.text .. "\n" .. block.text
-          else
-            result:insert(prev)
-            prev = block
-          end
-        end
-        if prev ~= nil then
-          result:insert(prev)
-        end
-        return result
-      end
-    })
     _quarto.ast.walk(quarto.utils.as_blocks(float.content), {
       RawBlock = function(el)
         if _quarto.format.isRawLatex(el) and el.text:match(_quarto.patterns.latexLongtablePattern) then
           raw = el
         end
-      end,
+      end
     })
     -- special case for singleton longtable floats
     if raw then
@@ -434,14 +413,14 @@ end, function(float)
         local result = pandoc.Blocks({latex_caption, pandoc.RawInline("latex", "\\tabularnewline")})
         -- if cap_loc is top, insert content on bottom
         if cap_loc == "top" then
-          result:insert(pandoc.RawBlock("latex-merge", content))        
+          result:insert(pandoc.RawBlock("latex", content))        
         else
-          result:insert(1, pandoc.RawBlock("latex-merge", content))
+          result:insert(1, pandoc.RawBlock("latex", content))
         end
-        result:insert(1, pandoc.RawBlock("latex-merge", start))
-        result:insert(1, pandoc.RawBlock("latex-merge", longtable_preamble))
-        result:insert(pandoc.RawBlock("latex-merge", "\\end{longtable}"))
-        result:insert(pandoc.RawBlock("latex-merge", longtable_postamble))
+        result:insert(1, pandoc.RawBlock("latex", start))
+        result:insert(1, pandoc.RawBlock("latex", longtable_preamble))
+        result:insert(pandoc.RawBlock("latex", "\\end{longtable}"))
+        result:insert(pandoc.RawBlock("latex", longtable_postamble))
         return result
       end
     end 
diff --git a/src/resources/filters/customnodes/proof.lua b/src/resources/filters/customnodes/proof.lua
new file mode 100644
index 0000000000..fa7d27be6a
--- /dev/null
+++ b/src/resources/filters/customnodes/proof.lua
@@ -0,0 +1,177 @@
+-- proof.lua
+-- custom AST node for proofs, remarks, solutions, etc.
+
+-- Copyright (C) 2023 Posit Software, PBC
+
+-- available proof types
+
+proof_types = {
+  proof =  {
+    env = 'proof',
+    title = 'Proof'
+  },
+  remark =  {
+    env = 'remark',
+    title = 'Remark'
+  },
+  solution = {
+    env = 'solution',
+    title = 'Solution'
+  }
+}
+
+function proof_type(el)
+  local type = el.attr.classes:find_if(function(clz) return proof_types[clz] ~= nil end)
+  if type ~= nil then
+    return proof_types[type]
+  else
+    return nil
+  end
+end
+
+_quarto.ast.add_handler({
+  -- empty table so this handler is only called programmatically
+  class_name = {},
+
+  -- the name of the ast node, used as a key in extended ast filter tables
+  ast_name = "Proof",
+
+  -- generic names this custom AST node responds to
+  -- this is still unimplemented
+  interfaces = {"Crossref"},
+
+  -- Proofs are always blocks
+  kind = "Block",
+
+  parse = function(div)
+    -- luacov: disable
+    internal_error()
+    -- luacov: enable
+  end,
+
+  slots = { "div", "name" },
+
+  constructor = function(tbl)
+    return {
+      name = tbl.name,
+      div = tbl.div,
+      identifier = tbl.identifier,
+      type = tbl.type -- proofs can be unnumbered and lack an identifier; we need to know the type explicitly
+    }
+  end
+})
+
+function is_proof_div(div)
+  local ref = refType(div.identifier)
+  if ref ~= nil then
+    local tbl = crossref.categories.by_ref_type[ref]
+    if tbl then
+      local key = tbl.name:lower()
+      return proof_types[key]
+    end
+  end
+  return is_regular_node(div, "Div") and proof_type(div) ~= nil
+end
+
+_quarto.ast.add_renderer("Proof", function()
+  return true 
+end, function(proof_tbl)
+  local el = proof_tbl.div
+  -- see if this is a proof, remark, or solution
+  local proof = proof_types[proof_tbl.type:lower()]
+  if proof == nil then
+    internal_error()
+    return pandoc.Blocks({})
+  end
+
+  -- ensure requisite latex is injected
+  crossref.using_theorems = true
+
+  if proof.env ~= "proof" then
+    el.attr.classes:insert("proof")
+  end
+
+  local name = quarto.utils.as_inlines(proof_tbl.name or pandoc.Inlines({}))
+
+  -- output
+  if _quarto.format.isLatexOutput() then
+    local preamble = pandoc.List()
+    local env = proof.env
+
+    local has_ref = refType(proof_tbl.identifier) ~= nil
+    if has_ref then
+      env = "ref" .. env
+    end
+
+    preamble:insert(pandoc.RawInline("latex", "\\begin{" .. env .. "}"))
+    if #name ~= 0 then
+      preamble:insert(pandoc.RawInline("latex", "["))
+      tappend(preamble, name)
+      preamble:insert(pandoc.RawInline("latex", "]"))
+    end
+    preamble:insert(pandoc.RawInline("latex", "\n"))
+    -- https://github.com/quarto-dev/quarto-cli/issues/6077
+    if el.content[1].t == "Para" then
+      preamble:extend(el.content[1].content)
+      el.content[1].content = preamble
+    else
+      if (el.content[1].t ~= "Para") then
+        -- required trick to get correct alignement when non Para content first
+        preamble:insert(pandoc.RawInline('latex', "\\leavevmode"))
+      end
+      el.content:insert(1, pandoc.Plain(preamble))
+    end
+    if has_ref then
+      el.content:insert(pandoc.RawInline("latex",
+        "\\label{" .. proof_tbl.identifier .. "}")
+      )
+    end
+    local end_env = "\\end{" .. env .. "}"
+    -- https://github.com/quarto-dev/quarto-cli/issues/6077
+    if el.content[#el.content].t == "Para" then
+      el.content[#el.content].content:insert(pandoc.RawInline("latex", "\n" .. end_env))
+    elseif el.content[#el.content].t == "RawBlock" and el.content[#el.content].format == "latex" then
+      -- this is required for no empty line between end_env and previous latex block
+      el.content[#el.content].text = el.content[#el.content].text .. "\n" .. end_env
+    else
+      el.content:insert(pandoc.RawBlock("latex", end_env))
+    end
+  elseif _quarto.format.isJatsOutput() then
+    el = jatsTheorem(el,  nil, name )
+  else
+    el.classes:insert(proof.title:lower())
+    local span_title = pandoc.Emph(pandoc.Str(envTitle(proof.env, proof.title)))
+    local entry = crossref.index.entries[proof_tbl.identifier]
+    local type = refType(proof_tbl.identifier)
+    if type then
+      el.identifier = proof_tbl.identifier
+    end
+    if entry then
+      span_title.content:insert(pandoc.Space())
+      span_title.content:extend(refNumberOption(type, entry))      
+    end
+
+    local span = pandoc.Span({ span_title }, pandoc.Attr("", { "proof-title" }))
+    if #name > 0 then
+      span.content:insert(pandoc.Str(" ("))
+      tappend(span.content, name)
+      span.content:insert(pandoc.Str(")"))
+    end
+    tappend(span.content, { pandoc.Str(". ")})
+
+    -- if the first block is a paragraph, then prepend the title span
+    if #el.content > 0 and 
+        el.content[1].t == "Para" and
+        el.content[1].content ~= nil and 
+        #el.content[1].content > 0 then
+      el.content[1].content:insert(1, span)
+    else
+      -- else insert a new paragraph
+      el.content:insert(1, pandoc.Para{span})
+    end
+    print(el)
+  end
+
+  return el
+
+end)
\ No newline at end of file
diff --git a/src/resources/filters/layout/columns-preprocess.lua b/src/resources/filters/layout/columns-preprocess.lua
index d4bd98f314..d68df8e366 100644
--- a/src/resources/filters/layout/columns-preprocess.lua
+++ b/src/resources/filters/layout/columns-preprocess.lua
@@ -9,9 +9,7 @@ function columns_preprocess()
       end
       local location = cap_location(float)
       if location == 'margin' then
-        if not float.classes:includes("column-margin") then
-          float.classes:insert('margin-caption')
-        end
+        float.classes:insert('margin-caption')
         noteHasColumns()
         return float
       end
@@ -34,13 +32,7 @@ function columns_preprocess()
         resolveElementForScopedColumns(figure, 'fig')
       end
       return el
-    end,
-
-    Image = function(img)
-      if img.classes:find_if(function(class) return class:match("^column%-") end) then
-        noteHasColumns()
-      end
-    end
+    end  
   }
 end
 
diff --git a/src/resources/filters/main.lua b/src/resources/filters/main.lua
index dd173c01e0..4d90c54856 100644
--- a/src/resources/filters/main.lua
+++ b/src/resources/filters/main.lua
@@ -145,6 +145,7 @@ import("./quarto-pre/panel-input.lua")
 import("./quarto-pre/panel-layout.lua")
 import("./quarto-pre/panel-sidebar.lua")
 import("./quarto-pre/parsefiguredivs.lua")
+import("./quarto-pre/parseblockreftargets.lua")
 import("./quarto-pre/project-paths.lua")
 import("./quarto-pre/resourcefiles.lua")
 import("./quarto-pre/results.lua")
@@ -174,6 +175,7 @@ import("./customnodes/callout.lua")
 import("./customnodes/panel-tabset.lua")
 import("./customnodes/floatreftarget.lua")
 import("./customnodes/theorem.lua")
+import("./customnodes/proof.lua")
 
 import("./layout/confluence.lua")
 import("./layout/ipynb.lua")
diff --git a/src/resources/filters/mainstateinit.lua b/src/resources/filters/mainstateinit.lua
index f3f7bfccb4..079aa972f8 100644
--- a/src/resources/filters/mainstateinit.lua
+++ b/src/resources/filters/mainstateinit.lua
@@ -19,7 +19,7 @@ quarto_global_state = {
 }
 
 crossref = {
-  usingTheorems = false,
+  using_theorems = false,
   startAppendix = nil,
 
   -- initialize autolabels table
@@ -87,10 +87,29 @@ crossref = {
         prefix = "Important",
         ref_type = "imp", -- this will look weird but we decided to do it for consistency with the original callout types
       },
+
+      -- proof envs
+      {
+        kind = "Block",
+        name = "Proof",
+        prefix = "Proof",
+        ref_type = "prf",
+      },
+      {
+        kind = "Block",
+        name = "Remark",
+        prefix = "Remark",
+        ref_type = "rem",
+      },
+      {
+        kind = "Block",
+        name = "Solution",
+        prefix = "Solution",
+        ref_type = "sol",
+      },
     }
     
-    -- eventually we'll have other block kinds here
-    -- with theorem and proof envs
+    -- eventually we'll have other block kinds here, specifically theorem envs
 
     -- eventually we'll have inline kinds here
     -- with equation refs
diff --git a/src/resources/filters/normalize/astpipeline.lua b/src/resources/filters/normalize/astpipeline.lua
index 6a97cb9501..80ba526a75 100644
--- a/src/resources/filters/normalize/astpipeline.lua
+++ b/src/resources/filters/normalize/astpipeline.lua
@@ -21,7 +21,8 @@ function quarto_ast_pipeline()
       name = "normalize-combine-2", 
       filter = combineFilters({
         parse_md_in_html_rawblocks(),
-        parse_reftargets(),
+        parse_floatreftargets(),
+        parse_blockreftargets()
       }),
     },
   }
diff --git a/src/resources/filters/normalize/flags.lua b/src/resources/filters/normalize/flags.lua
index f080de6d72..5f3bddd2a3 100644
--- a/src/resources/filters/normalize/flags.lua
+++ b/src/resources/filters/normalize/flags.lua
@@ -69,7 +69,7 @@ function compute_flags()
     end,
     Div = function(node)
       local type = refType(node.attr.identifier)
-      if theorem_types[type] ~= nil or proofType(node) ~= nil then
+      if theorem_types[type] ~= nil or proof_type(node) ~= nil then
         flags.has_theorem_refs = true
       end
 
diff --git a/src/resources/filters/quarto-post/latex.lua b/src/resources/filters/quarto-post/latex.lua
index 55b65a7e92..42ab1a765c 100644
--- a/src/resources/filters/quarto-post/latex.lua
+++ b/src/resources/filters/quarto-post/latex.lua
@@ -276,10 +276,6 @@ function render_latex()
       })
       return float, false
     end,
-    Figure = function(fig)
-      -- defer rendering of figure to own pass
-      return nil, false
-    end,
     Image = function(img)
       if img.classes:includes("column-margin") then
         return handle_column_classes(pandoc.Span(img, img.attr))
diff --git a/src/resources/filters/quarto-pre/parseblockreftargets.lua b/src/resources/filters/quarto-pre/parseblockreftargets.lua
new file mode 100644
index 0000000000..68631e69f5
--- /dev/null
+++ b/src/resources/filters/quarto-pre/parseblockreftargets.lua
@@ -0,0 +1,73 @@
+-- parseblockreftargets.lua
+-- Copyright (C) 2023 Posit Software, PBC
+
+-- parses Proofs, Theorems, Lemmas, etc.
+
+function parse_blockreftargets()
+
+  local function parse_theorem_div(el)
+    if not has_theorem_ref(el) then
+      return
+    end
+    -- capture then remove name
+    local name = markdownToInlines(el.attr.attributes["name"])
+    if not name or #name == 0 then
+      name = resolveHeadingCaption(el)
+    end
+    el.attr.attributes["name"] = nil 
+    local identifier = el.attr.identifier
+    -- remove identifier to avoid infinite recursion
+    el.attr.identifier = ""
+    return quarto.Theorem {
+      identifier = identifier,
+      name = name,
+      div = el
+    }, false
+  end
+
+  local function parse_proof_div(el)
+    if not is_proof_div(el) then
+      return
+    end
+
+    local name = string_to_quarto_ast_inlines(el.attributes["name"] or "")
+    if not name or #name == 0 then
+      name = resolveHeadingCaption(el) or pandoc.Inlines({})
+    end
+    el.attributes["name"] = nil 
+    local identifier = el.identifier
+    el.identifier = ""
+
+    local ref = refType(identifier)
+    local proof_type
+    if ref ~= nil then
+      proof_type = crossref.categories.by_ref_type[ref].name
+    else
+      proof_type = el.classes:find_if(function(clz) return proof_types[clz] ~= nil end)
+      if proof_type == nil then
+        internal_error()
+        return
+      end
+      proof_type = proof_types[proof_type].title
+    end
+    el.classes = el.classes:filter(function(clz) return proof_types[clz] == nil end)
+    crossref.using_theorems = true
+    local tbl = {
+      identifier = identifier,
+      name = name,
+      div = el,
+      type = proof_type
+    }
+    return quarto.Proof(tbl), false
+  end
+
+  return {
+    Div = function(div)
+      if is_theorem_div(div) then
+        return parse_theorem_div(div)
+      elseif is_proof_div(div) then
+        return parse_proof_div(div)
+      end
+    end
+  }
+end
\ No newline at end of file
diff --git a/src/resources/filters/quarto-pre/parsefiguredivs.lua b/src/resources/filters/quarto-pre/parsefiguredivs.lua
index fe57eee022..34e8a80de6 100644
--- a/src/resources/filters/quarto-pre/parsefiguredivs.lua
+++ b/src/resources/filters/quarto-pre/parsefiguredivs.lua
@@ -126,33 +126,8 @@ local function kable_raw_latex_fixups(content, identifier)
   return matches, content
 end
 
-function parse_reftargets()
+function parse_floatreftargets()
   
-  local function parse_theorem_div(div)
-    if has_theorem_ref(div) then
-      local el = div
-      -- capture then remove name
-      local name = markdownToInlines(el.attr.attributes["name"])
-      if not name or #name == 0 then
-        name = resolveHeadingCaption(el)
-      end
-      el.attr.attributes["name"] = nil 
-      local identifier = el.attr.identifier
-      -- remove identifier to avoid infinite recursion
-      el.attr.identifier = ""
-      return quarto.Theorem {
-        identifier = identifier,
-        name = name,
-        div = div
-      }, false
-    end
-    -- local types = theorem_types
-    -- local type = refType(el.attr.identifier)
-    -- local theorem_type = types[type]
-    -- if theorem_type then
-    -- end
-  end
-
   local function parse_float_div(div)
     process_div_caption_classes(div)
     local ref = refType(div.identifier)
@@ -253,9 +228,6 @@ function parse_reftargets()
       local layout_classes = attr.classes:filter(
         function(c) return c:match("^column-") end
       )
-      div.classes = div.classes:filter(
-        function(c) return not c:match("^column-") end
-      )
       if #layout_classes then
         attr.classes = attr.classes:filter(
           function(c) return not layout_classes:includes(c) end)
@@ -423,8 +395,6 @@ function parse_reftargets()
         return parse_float_div(div)
       elseif isTableDiv(div) then
         return parse_float_div(div)
-      elseif is_theorem_div(div) then
-        return parse_theorem_div(div)
       end
 
       if div.classes:includes("cell") then
diff --git a/src/resources/pandoc/datadir/_format.lua b/src/resources/pandoc/datadir/_format.lua
index 5f61bc624c..a709357b62 100644
--- a/src/resources/pandoc/datadir/_format.lua
+++ b/src/resources/pandoc/datadir/_format.lua
@@ -21,7 +21,7 @@ local function isRawHtml(rawEl)
 end
 
 local function isRawLatex(rawEl)
-  return isRaw(rawEl) and (rawEl.format == "tex" or rawEl.format == "latex" or rawEl.format == "latex-merge" or rawEl.format == "tex-merge")
+  return isRaw(rawEl) and (rawEl.format == "tex" or rawEl.format == "latex")
 end
 
 -- check for latex output
diff --git a/src/resources/projects/website/templates/sidebaritem.ejs b/src/resources/projects/website/templates/sidebaritem.ejs
index 7b68805cba..8796ad6689 100644
--- a/src/resources/projects/website/templates/sidebaritem.ejs
+++ b/src/resources/projects/website/templates/sidebaritem.ejs
@@ -1,7 +1,7 @@
 <% if (item.href && item.text && !item.contents) { %>
 <li class="sidebar-item">
   <div class="sidebar-item-container"> 
-  <a href="<%- item.href %>" <%= item.id ? `id="${item.id}" ` : "" %>class="sidebar-item-text sidebar-link<%- item.active ? " active" : "" %>"<%- item.target ? ` target="${item.target}"` : "" %>><% partial('navicon.ejs', { item }) %> <span class="menu-text"><%= item.text %></span></a>
+  <a href="<%- item.href %>" class="sidebar-item-text sidebar-link<%- item.active ? " active" : "" %>"<%- item.target ? ` target="${item.target}"` : "" %>><% partial('navicon.ejs', { item }) %> <span class="menu-text"><%= item.text %></span></a>
   </div>
 </li>
 <% } else if (item.contents && item.text) { %>  
@@ -17,11 +17,11 @@
     <% if (item.contents.length > 0) { %>
       <div class="sidebar-item-container"> 
           <% if (item.href) { %>
-            <a href="<%- item.href %>" <%= item.id ? `id="${item.id}" ` : "" %>class="sidebar-item-text sidebar-link<%- item.active ? " active" : "" %>"<%- item.target ? ` target="${item.target}"` : "" %>><% partial('navicon.ejs', { item }) %> <span class="menu-text"><%= item.text %></span></a>
+            <a href="<%- item.href %>" class="sidebar-item-text sidebar-link<%- item.active ? " active" : "" %>"<%- item.target ? ` target="${item.target}"` : "" %>><% partial('navicon.ejs', { item }) %> <span class="menu-text"><%= item.text %></span></a>
           <% } else { %> 
-            <a <%= item.id ? `id="${item.id}" ` : "" %>class="sidebar-item-text sidebar-link text-start<%- isCollapsed ? " collapsed" : "" %>" data-bs-toggle="collapse" data-bs-target="#<%- sectionId %>" aria-expanded="<%- isCollapsed ? "false" : "true" %>"><% partial('navicon.ejs', { item }) %> <span class="menu-text"><%= item.text %></span></a>
+            <a class="sidebar-item-text sidebar-link text-start<%- isCollapsed ? " collapsed" : "" %>" data-bs-toggle="collapse" data-bs-target="#<%- sectionId %>" aria-expanded="<%- isCollapsed ? "false" : "true" %>"><% partial('navicon.ejs', { item }) %> <span class="menu-text"><%= item.text %></span></a>
           <% }  %>      
-          <a <%= item.id ? `id="${item.id}-toggle" ` : "" %>class="sidebar-item-toggle text-start<%- isCollapsed ?  " collapsed" : "" %>" data-bs-toggle="collapse" data-bs-target="#<%- sectionId %>" aria-expanded="<%- isCollapsed ? "false" : "true" %>" aria-label="<%- language['toggle-section'] %>">
+          <a class="sidebar-item-toggle text-start<%- isCollapsed ?  " collapsed" : "" %>" data-bs-toggle="collapse" data-bs-target="#<%- sectionId %>" aria-expanded="<%- isCollapsed ? "false" : "true" %>" aria-label="<%- language['toggle-section'] %>">
             <i class="bi bi-chevron-right ms-2"></i>
           </a> 
       </div>
@@ -31,8 +31,8 @@
         <% }) %>
       </ul>
     <% } else { %>
-      <span class="sidebar-item-text sidebar-link text-start" <%- item.id ? `id="${item.id}" ` : "" %>><% partial('navicon.ejs', { item }) %> <span class="menu-text"><%= item.text %></span></span>
-    <% } %> 
+      <span class="sidebar-item-text sidebar-link text-start"><% partial('navicon.ejs', { item }) %> <span class="menu-text"><%= item.text %></span></span>
+    <% } %>
 
   </li>
 <% } else if (item.text && item.text.match(/^\-+$/)) { %>
diff --git a/version.txt b/version.txt
index a0d80da657..fb7a165737 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.4.529
+1.4.528