Supported HTML for help center articles

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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

All tags supports the following inline styles in addition to the inline styles listed in on the individual tags: 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-spacing
In most cases, Zendesk recommends using CSS classes instead of inline styles to style help center content. See Styling HTML in help articles.

a

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

footer

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

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

nav

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

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