diff --git a/synapse/rest/media/v1/preview_html.py b/synapse/rest/media/v1/preview_html.py
index e72c8987cc..13ec7ab533 100644
--- a/synapse/rest/media/v1/preview_html.py
+++ b/synapse/rest/media/v1/preview_html.py
@@ -246,7 +246,9 @@ def parse_html_description(tree: "etree.Element") -> Optional[str]:
Grabs any text nodes which are inside the <body/> tag, unless they are within
an HTML5 semantic markup tag (<header/>, <nav/>, <aside/>, <footer/>), or
- if they are within a <script/> or <style/> tag.
+ if they are within a <script/>, <svg/> or <style/> tag, or if they are within
+ a tag whose content is usually only shown to old browsers
+ (<iframe/>, <video/>, <canvas/>, <picture/>).
This is a very very very coarse approximation to a plain text render of the page.
@@ -268,6 +270,12 @@ def parse_html_description(tree: "etree.Element") -> Optional[str]:
"script",
"noscript",
"style",
+ "svg",
+ "iframe",
+ "video",
+ "canvas",
+ "img",
+ "picture",
etree.Comment,
)
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