Canvas HTML Editor Allowlist
This document lists the HTML codes that are permissible in Canvas.
Allowed HTML Tags
a, acronym, address, area, article, aside, audio, b, bdo, big, blockquote, br, caption, cite, code, col, colgroup, dd, del, details, dfn, div, dl, dt, em, embed, footer, h2, h3, h4, h5, h6, header, hr, i, img, ins iframe, kbd, legend, li, map, nav, object, ol, p, param, picture, pre, q, ruby, rp, rt, samp, section, small, span, strike strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, time, tr, track, tt, u, ul, var, video
MathML tags
annotation, annotation-xml, maction, maligngroup, malignmark, math, menclose, merror, mfenced, mfrac, mglyph, mi, mlabeledtr, mlongdiv, mmultiscripts, mn, mo, mover, mpadded, mphantom, mprescripts, mroot, mrow, ms, mscarries, mscarry, msgroup, msline, mspace, msqrt, msrow, mstack, mstyle, msub, msubsup, msup, mtable, mtd, mtext, mtr, munder, munderover, none, semantics, mark
Allowed Attributes on HTML Elements
all elements allow style, class, id, title, role, lang, dir
| Element | Allowed Attribute(s) |
| a | href, target, name |
| abbr | title |
| area | alt, coords, href, shape, target |
| aria | labelledby, atomic, busy, controls, describedby, disabled, dropeffect, flowto, grabbed, haspopup, hidden, invalid, label, labelledby, live, owns, relevant, autocomplete, checked, disabled, expanded, haspopup, hidden, invalid, label, level, multiline, multiselectable, orientation, pressed, readonly, required, selected, sort, valuemax, valuemin, valuenow, valuetext |
| audio | name, src, muted, controls |
| blockquote | cite |
| col | span, width |
| colgroup | span, width |
| embed | name, src, type, allowfullscreen, pluginspage, wmode, allowscriptaccess, width, height |
| font | face, color, size |
| img | align, alt, height, src, title, usemap, width |
| iframe | src, width, height, name, align, scrolling, allowfullscreen |
| map | name |
| object | width, height, style, data, type, classid, codebase |
| ol | start, type |
| param | name, value |
| q | cite |
| source | Media, sizes, src, srcset, type |
| table | summary, width, border, cellpadding, cellspacing, center, frame, rules |
| tr |
align, valign, dir |
| td |
abbr, axis, colspan, rowspan, width, align, valign, dir |
| th |
abbr, axis, colspan, rowspan, width, align, valign, dir, scope |
| ul |
type |
| video |
name, src, allowfullscreen, muted, poster, width, height, controls, playsinline |
Allowed protocols for some elements
ftp, http, https, mailto
- a href
http, https
- blockquote cite
- img src
- q cite
- object data
- embed src
- iframe src
- style any
skype
- href
Allowed style properties
background, border, border-radius, clear, color, cursor, direction, display, flex, float, font, grid, height, left line-height, list-style, margin, max-height, max-width, min-height, min-width, overflow overflow-x, overflow-y, padding, position, right, text-align, table-layout text-decoration, text-indent, top, vertical-align, visibility, white-space, width z-index, zoom
Last update: 2021-07-07
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