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This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

The -moz-user-modify property has no effect. It was originally planned to determine whether or not the content of an element can be edited by a user.

/* Keyword values */
-moz-user-modify: read-only;
-moz-user-modify: read-write;
-moz-user-modify: write-only;

/* Global values */
-moz-user-modify: inherit;
-moz-user-modify: initial;
-moz-user-modify: unset;

This property is related to the contenteditable attribute.

Initial valueread-only
Applies toall elements
Computed valueas specified
Animation typediscrete
Canonical orderthe unique non-ambiguous order defined by the formal grammar


The -moz-user-modify property is specified as one of the keyword values from the list below.


Default value. Contents are read-only.
The user is able to read and write contents.
The user is able to edit the content, but not to read it.

Formal syntax

read-only | read-write | write-only



<div class="readwrite">The user is able to change this text.</div>


.readwrite {
  -moz-user-modify: read-write;
  -webkit-user-modify: read-write;


This property is not part of any specification. A similar property, user-focus, was proposed in early drafts of a predecessor of the CSS3 UI specification, but was rejected by the working group.

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 1[1]-webkit (Yes)[1]-webkit

No support[2]

No support No support 2.0 -khtml
3.0 -webkit[1]
Feature Android Android Webview Edge Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support ? ? (Yes)-webkit No support ? ? ? 18[1]-webkit

[1] Also supported: -webkit-user-modify: read-write-plaintext-only (Richtext will be lost).
[2] While the CSS property is parsed and accepted, it does not have any effect.

See also

Document Tags and Contributors

 Last updated by: mfluehr,