matplotlib
diff --git a/‎doc/api/next_api_changes/deprecations.rst
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diff --git a/‎lib/matplotlib/__init__.py
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diff --git a/‎lib/matplotlib/animation.py
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+11-5Lines changed: 11 additions & 5 deletions b/‎lib/matplotlib/animation.py
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+11-5Lines changed: 11 additions & 5 deletions
diff --git a/‎matplotlibrc.template
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@@ -381,3 +381,8 @@ Path helpers in :mod:`.bezier`
 
 ``bezier.concatenate_paths`` is deprecated.  Use ``Path.make_compound_path()``
 instead.
+
+``animation.html_args`` rcParam
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The unused ``animation.html_args`` rcParam and ``animation.HTMLWriter.args_key``
+attribute are deprecated.
@@ -619,6 +619,7 @@ def gen_candidates():
     'datapath': ('3.2.1',),
     'animation.avconv_path': ('3.3',),
     'animation.avconv_args': ('3.3',),
+    'animation.html_args': ('3.3',),
     'mathtext.fallback_to_cm': ('3.3',),
     'keymap.all_axes': ('3.3',),
     'savefig.jpeg_quality': ('3.3',),
 
@@ -784,7 +784,11 @@ class HTMLWriter(FileMovieWriter):
     """Writer for JavaScript-based HTML movies."""
 
     supported_formats = ['png', 'jpeg', 'tiff', 'svg']
-    _args_key = 'animation.html_args'
+
+    @cbook.deprecated("3.3")
+    @property
+    def args_key(self):
+        return 'animation.html_args'
 
     @classmethod
     def isAvailable(cls):
@@ -793,21 +797,23 @@ def isAvailable(cls):
     def __init__(self, fps=30, codec=None, bitrate=None, extra_args=None,
                  metadata=None, embed_frames=False, default_mode='loop',
                  embed_limit=None):
+
+        if extra_args:
+            _log.warning("HTMLWriter ignores 'extra_args'")
+        extra_args = ()  # Don't lookup nonexistent rcParam[args_key].
         self.embed_frames = embed_frames
         self.default_mode = default_mode.lower()
+        cbook._check_in_list(['loop', 'once', 'reflect'],
+                             default_mode=self.default_mode)
 
         # Save embed limit, which is given in MB
         if embed_limit is None:
             self._bytes_limit = mpl.rcParams['animation.embed_limit']
         else:
             self._bytes_limit = embed_limit
-
         # Convert from MB to bytes
         self._bytes_limit *= 1024 * 1024
 
-        cbook._check_in_list(['loop', 'once', 'reflect'],
-                             default_mode=self.default_mode)
-
         super().__init__(fps, codec, bitrate, extra_args, metadata)
 
     def setup(self, fig, outfile, dpi, frame_dir=None):
 
@@ -728,7 +728,6 @@
 #animation.bitrate: -1            # Controls size/quality tradeoff for movie.
                                   # -1 implies let utility auto-determine
 #animation.frame_format: png      # Controls frame format used by temp files
-#animation.html_args:             # Additional arguments to pass to html writer
 #animation.ffmpeg_path:  ffmpeg   # Path to ffmpeg binary. Without full path
                                   # $PATH is searched
 #animation.ffmpeg_args:           # Additional arguments to pass to ffmpeg