maxlength attribute for input and textarea elements

Declares an upper bound on the number of characters the user can input. Normally the UI ignores attempts by the user to type in additional characters beyond this limit.

WHATWG Living Standard: https://html.spec.whatwg.org/multipage/forms.html#attr-input-maxlength

Usage: 98.2% + 0.18% = 98.4%

Support summary

Notes

  1. `<textarea>`'s' UI does not prevent the user from typing additional characters beyond the `maxlength` limit.
  2. Does not support the `HTMLTextAreaElement.maxLength` DOM property.
  3. Does not support `ValidityState.tooLong`. In some cases, this is because `.validity` is not supported in the first place.
  4. Does not support `ValidityState.tooLong` correctly in the (unlikely) case of the value being initially set too long, then changed by the user to a still incorrect state. See Firefox bug and MS Edge bug.
  5. `<input>`'s UI does not prevent the user from typing additional characters beyond the `maxlength` limit between two existing characters of the string.
  6. Allows text beyond maxlength to be entered at first, but removes all characters past the maxlength when focus is lost.

Links

Full support table

IE

5.567891011
uaaaayy

Edge

121314151617187980818384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124
yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Firefox

233.53.6456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128
aaaayyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Chrome

4567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127
yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Safari

3.13.2455.166.177.1899.11010.11111.11212.11313.11414.11515.115.2-15.315.415.515.616.016.116.216.316.416.516.617.017.117.217.317.417.5TP
uaauyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Opera

99.5-9.610.0-10.110.510.61111.111.511.61212.11516171819202122232425262728293031323334353637383940414243444546474849505152535455565758606263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109
uaaaaaaaaaayyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Safari on iOS

3.24.0-4.14.2-4.35.0-5.16.0-6.17.0-7.188.1-8.49.0-9.29.310.0-10.210.311.0-11.211.3-11.412.0-12.112.2-12.513.0-13.113.213.313.4-13.714.0-14.414.5-14.815.0-15.115.2-15.315.415.515.6-15.816.016.116.216.316.416.516.6-16.717.017.117.217.317.417.5
uyyyyyaayyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy

Opera Mini

all
a

Android Browser

2.12.22.3344.14.2-4.34.44.4.3-4.4.4124
uuyyyyyyyy

Blackberry Browser

710
yy

Opera Mobile

101111.111.51212.180
aaaaaay

Chrome for Android

124
y

Firefox for Android

125
y

IE Mobile

1011
yy

UC Browser for Android

15.5
y

Samsung Internet

45.0-5.46.2-6.47.2-7.48.29.210.111.1-11.212.013.014.015.016.017.018.019.02021222324
yyyyyyyyyyyyyyyyyyyyy

QQ Browser

14.9
y

Baidu Browser

13.52
y

KaiOS Browser

2.53.0-3.1
yy

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