The source code editor lets you edit the HTML source of articles and content blocks for the help center. This lets you customize and style help center content in ways that aren't possible using the standard WYSIWYG editor. To keep your help center secure and provide the best end-user experience, Zendesk limits the HTML you can use in articles and content blocks.
The following sections list the HTML elements, attributes, and content supported in articles and content blocks. In addition to the listed attributes, the HTML elements in this section also support the following global attributes:
aria-*, class, data-*,
dir, id, lang,
tabindex, title
aspect-ratio, background,
background-color, background-image,
border, border-bottom,
border-bottom-color, border-bottom-style,
border-bottom-width, border-collapse,
border-color, border-left,
border-left-color, border-left-style,
border-left-width, border-radius,
border-right, border-right-color,
border-right-style, border-right-width,
border-spacing, border-style,
border-top, border-top-color,
border-top-style, border-top-width,
border-width, box-sizing,
color, display, font,
font-family, font-size,
font-style, font-variant,
font-variant-caps,
font-variant-ligatures, font-weight,
height, letter-spacing,
line-height, max-height,
max-width, min-height,
min-width, orphans,
outline, padding,
padding-bottom, padding-left,
padding-right, padding-top,
text-align, text-decoration,
text-decoration-color,
text-decoration-line,
text-decoration-style, text-indent,
text-transform, vertical-align,
white-space, widows,
width, word-spacinga
Attributes: href, name,
rel, target, title
Allowed protocols for href: ftp,
http, https, mailto,
sftp, sms, tel
Allowed inline styles: only global styles
Content: @text, abbr,
address, aside, audio,
bdi, bdo, blockquote,
br, cite, code,
data, del, details,
dfn, div, dl,
em, figure, footer,
h1, h2, h3,
h4, h5, h6,
header, hr, img,
ins, kbd, mark,
noscript, ol, p,
pre, q, ruby,
s, samp, section,
small, span, strong,
sub, summary, sup,
table, time, ul,
var, video
abbr
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
address
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
footer, header, hr,
iframe, img, ins,
kbd, mark, noscript,
ol, p, pre,
q, ruby, s,
samp, section, small,
span, strong, sub,
summary, sup, table,
time, ul, var,
video
article
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
footer, h1, h2,
h3, h4, h5,
h6, header, hr,
iframe, img, ins,
kbd, mark, noscript,
ol, p, pre,
q, ruby, s,
samp, section, small,
span, strong, sub,
summary, sup, table,
time, ul, var,
video
aside
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
footer, h1, h2,
h3, h4, h5,
h6, header, hr,
iframe, img, ins,
kbd, mark, noscript,
ol, p, pre,
q, ruby, s,
samp, section, small,
span, strong, sub,
summary, sup, table,
time, ul, var,
video
audio
Attributes: autoplay, controls,
disableremoteplayback, loop,
muted, preload, src
Allowed protocols for src: blob,
data, http, https
Allowed inline styles: only global styles
Content: @text, a,
abbr, bdi, bdo,
br, cite, code,
data, del, dfn,
em, iframe, img,
ins, kbd, mark,
noscript, q, ruby,
s, samp, small,
source, span, strong,
sub, summary, sup,
time, track, var
bdi
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
bdo
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
blockquote
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
footer, h1, h2,
h3, h4, h5,
h6, header, hr,
iframe, img, ins,
kbd, mark, noscript,
ol, p, pre,
q, ruby, s,
samp, section, small,
span, strong, sub,
summary, sup, table,
time, ul, var,
video
br
Attributes: only global attributes
Allowed inline styles: only global styles
Content: void element
caption
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
footer, h1, h2,
h3, h4, h5,
h6, header, hr,
iframe, img, ins,
kbd, mark, noscript,
ol, p, pre,
q, ruby, s,
samp, section, small,
span, strong, sub,
summary, sup, table,
time, ul, var,
video
cite
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
code
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
col
Attributes: span
Allowed inline styles: only global styles
Content: void element
colgroup
Attributes: span
Allowed inline styles: only global styles
Content: col
data
Attributes: value
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
dd
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
footer, h1, h2,
h3, h4, h5,
h6, header, hr,
iframe, img, ins,
kbd, mark, noscript,
ol, p, pre,
q, ruby, s,
samp, section, small,
span, strong, sub,
summary, sup, table,
time, ul, var,
video
del
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
details
Attributes: open
Allowed inline styles: only global styles
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
footer, h1, h2,
h3, h4, h5,
h6, header, hr,
iframe, img, ins,
kbd, mark, noscript,
ol, p, pre,
q, ruby, s,
samp, section, small,
span, strong, sub,
summary, sup, table,
time, ul, var,
video
dfn
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
em, iframe, img,
ins, kbd, mark,
noscript, q, ruby,
s, samp, small,
span, strong, sub,
summary, sup, time,
var, video
div
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
footer, h1, h2,
h3, h4, h5,
h6, header, hr,
iframe, img, ins,
kbd, mark, noscript,
ol, p, pre,
q, ruby, s,
samp, section, small,
span, strong, sub,
summary, sup, table,
time, ul, var,
video
dl
Attributes: only global attributes
Allowed inline styles: only global styles
Content: dd, dt
dt
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
em
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
figcaption
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
footer, h1, h2,
h3, h4, h5,
h6, header, hr,
iframe, img, ins,
kbd, mark, noscript,
ol, p, pre,
q, ruby, s,
samp, section, small,
span, strong, sub,
summary, sup, table,
time, ul, var,
video
figure
Attributes: only global attributes
Allowed inline styles: float
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figcaption,
figure, footer, h1,
h2, h3, h4,
h5, h6, header,
hr, iframe, img,
ins, kbd, mark,
noscript, ol, p,
pre, q, ruby,
s, samp, section,
small, span, strong,
sub, summary, sup,
table, time, ul,
var, video
h1
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
h2
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
h3
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
h4
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
h5
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
h6
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
header
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
h1, h2, h3,
h4, h5, h6,
hr, iframe, img,
ins, kbd, mark,
noscript, ol, p,
pre, q, ruby,
s, samp, section,
small, span, strong,
sub, summary, sup,
table, time, ul,
var, video
hr
Attributes: only global attributes
Allowed inline styles: only global styles
Content: void element
iframe
Attributes: allow,
allowfullscreen, frameborder,
height, mozallowfullscreen,
msallowfullscreen, name,
oallowfullscreen, src,
webkitallowfullscreen, width
Allowed protocols for src: blob,
data, http, https
Allowed domains for embeds:
https://content.jwplatform.com/,
https://fast.wistia.com/,
https://play.vidyard.com/,
https://player.vimeo.com/,
https://players.brightcove.net/,
https://web.microsoftstream.com/,
https://www.loom.com/,
https://www.microsoft.com/,
https://www.youtube-nocookie.com/,
https://www.youtube.com/
Allowed inline styles: only global styles
Content: void element
img
Attributes: alt, height,
name, src, width
Allowed protocols for src: blob,
data, http, https
Allowed inline styles: only global styles
Content: void element
ins
Attributes: cite, datetime
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
kbd
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
li
Attributes: only global attributes
Allowed inline styles: list-style,
list-style-image, list-style-position,
list-style-type
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
footer, h1, h2,
h3, h4, h5,
h6, header, hr,
iframe, img, ins,
kbd, mark, noscript,
ol, p, pre,
q, ruby, s,
samp, section, small,
span, strong, sub,
summary, sup, table,
time, ul, var,
video
mark
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
noscript
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, q, ruby,
s, samp, small,
span, strong, sub,
summary, sup, time,
var, video
ol
Attributes: reversed, start,
type
Allowed inline styles: list-style,
list-style-image, list-style-position,
list-style-type
Content: li
p
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
pre
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
q
Attributes: cite
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
rp
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text
rt
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
ruby
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
rp, rt, ruby,
s, samp, small,
span, strong, sub,
summary, sup, time,
var, video
s
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
samp
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
section
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
footer, h1, h2,
h3, h4, h5,
h6, header, hr,
iframe, img, ins,
kbd, mark, noscript,
ol, p, pre,
q, ruby, s,
samp, section, small,
span, strong, sub,
summary, sup, table,
time, ul, var,
video
small
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
source
Attributes: src, type
Allowed protocols for src: blob,
data, http, https
Allowed inline styles: only global styles
Content: void element
span
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
strong
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
sub
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
summary
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, h1,
h2, h3, h4,
h5, h6, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
sup
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
table
Attributes: border, cellpadding,
cellspacing
Allowed inline styles: margin,
margin-bottom, margin-left,
margin-right, margin-top
Content: caption, colgroup,
tbody, tfoot, thead,
tr
tbody
Attributes: only global attributes
Allowed inline styles: only global styles
Content: tr
td
Attributes: colspan, rowspan
Allowed inline styles: only global styles
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
footer, h1, h2,
h3, h4, h5,
h6, header, hr,
iframe, img, ins,
kbd, mark, noscript,
ol, p, pre,
q, ruby, s,
samp, section, small,
span, strong, sub,
summary, sup, table,
time, ul, var,
video
tfoot
Attributes: only global attributes
Allowed inline styles: only global styles
Content: tr
th
Attributes: colspan, rowspan,
scope
Allowed inline styles: only global styles
Content: @text, a,
abbr, address, aside,
audio, bdi, bdo,
blockquote, br, cite,
code, data, del,
details, dfn, div,
dl, em, figure,
footer, h1, h2,
h3, h4, h5,
h6, header, hr,
iframe, img, ins,
kbd, mark, noscript,
ol, p, pre,
q, ruby, s,
samp, section, small,
span, strong, sub,
summary, sup, table,
time, ul, var,
video
thead
Attributes: only global attributes
Allowed inline styles: only global styles
Content: tr
time
Attributes: datetime
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
tr
Attributes: only global attributes
Allowed inline styles: only global styles
Content: td, th
track
Attributes: default, kind,
label, src, srclang
Allowed protocols for src: blob,
data, http, https
Allowed inline styles: only global styles
Content: void element
ul
Attributes: only global attributes
Allowed inline styles: list-style,
list-style-image, list-style-position,
list-style-type
Content: li
var
Attributes: only global attributes
Allowed inline styles: only global styles
Content: @text, a,
abbr, audio, bdi,
bdo, br, cite,
code, data, del,
dfn, em, iframe,
img, ins, kbd,
mark, noscript, q,
ruby, s, samp,
small, span, strong,
sub, summary, sup,
time, var, video
video
Attributes: controls, height,
poster, preload, src,
width
Allowed protocols for src: blob,
data, http, https
Allowed inline styles: only global styles
Content: source, track