diff --git a/_extensions/iconify/_extension.yml b/_extensions/iconify/_extension.yml
index 2b05ae4..8801ddb 100644
--- a/_extensions/iconify/_extension.yml
+++ b/_extensions/iconify/_extension.yml
@@ -1,6 +1,7 @@
 title: Iconify support
 author: Mickaël Canouil
-version: 0.3.0
+version: 1.0.0
+quarto-required: ">=1.2.280"
 contributes:
   shortcodes:
     - iconify.lua
diff --git a/_extensions/iconify/iconify.lua b/_extensions/iconify/iconify.lua
index c01c9d4..7e9ce0d 100644
--- a/_extensions/iconify/iconify.lua
+++ b/_extensions/iconify/iconify.lua
@@ -1,17 +1,17 @@
-local function ensureHtmlDeps()
-  quarto.doc.addHtmlDependency({
+local function ensure_html_deps()
+  quarto.doc.add_html_dependency({
     name = 'iconify',
     version = '1.0.0-beta.2',
     scripts = {"iconify-icon.min.js"}
   })
 end
 
-local function isEmpty(s)
+local function is_empty(s)
   return s == nil or s == ''
 end
 
-local function isValidSize(size)
-  if isEmpty(size) then
+local function is_valid_size(size)
+  if is_empty(size) then
     return ''
   end
   local size_table = {
@@ -53,8 +53,8 @@ end
 return {
   ["iconify"] = function(args, kwargs)
     -- detect html (excluding epub which won't handle fa)
-    if quarto.doc.isFormat("html:js") then
-      ensureHtmlDeps()
+    if quarto.doc.is_format("html:js") then
+      ensure_html_deps()
       local set = "fluent-emoji"
       local icon = pandoc.utils.stringify(args[1])
       if #args > 1 then
@@ -65,41 +65,41 @@ return {
       local attributes = ' icon="' .. set .. ':' .. icon .. '"'
       local label = '"Icon ' .. icon .. ' from ' .. set .. ' Iconify.design set."'
 
-      local size = isValidSize(pandoc.utils.stringify(kwargs["size"]))
-      if not isEmpty(size) then
+      local size = is_valid_size(pandoc.utils.stringify(kwargs["size"]))
+      if not is_empty(size) then
         attributes = attributes .. ' style="' .. size .. '"'
       end
 
       local aria_label = pandoc.utils.stringify(kwargs["label"])
-      if isEmpty(aria_label) then
+      if is_empty(aria_label) then
         aria_label =  ' aria-label="' .. label .. '"'
       else 
         attributes = attributes .. aria_label
       end
       local title = pandoc.utils.stringify(kwargs["title"])
-      if isEmpty(title) then
+      if is_empty(title) then
         title =  ' title="' .. label .. '"'
       else 
         attributes = attributes .. title
       end
       -- local style = pandoc.utils.stringify(kwargs["style"])
-      -- if not isEmpty(style) then
+      -- if not is_empty(style) then
       --   local attributes = attributes .. ' style="' .. style .. '"'
       -- end
       local width = pandoc.utils.stringify(kwargs["width"])
-      if not isEmpty(width) and isEmpty(size) then
+      if not is_empty(width) and is_empty(size) then
         attributes = attributes .. ' width="' .. width .. '"'
       end
       local height = pandoc.utils.stringify(kwargs["height"])
-      if not isEmpty(height) and isEmpty(size)  then
+      if not is_empty(height) and is_empty(size)  then
         attributes = attributes .. ' height="' .. height .. '"'
       end
       local flip = pandoc.utils.stringify(kwargs["flip"])
-      if not isEmpty(flip) then
+      if not is_empty(flip) then
         attributes = attributes .. ' flip="' .. flip.. '"'
       end
       local rotate = pandoc.utils.stringify(kwargs["rotate"])
-      if not isEmpty(rotate) then
+      if not is_empty(rotate) then
         attributes = attributes .. ' rotate="' .. rotate .. '"'
       end