The same special character, why is the number of bits displayed in edge and ie different?

Question

The same special character, why is the number of bits displayed in edge and ie different?

广凯李 20

In the same html code, the maxlength of input is fixed y. Why can't edge continue to enter after entering some special characters, while ie can continue to enter one or two half-width characters.

Please give me some help.

Anonymous

2023-05-29T01:58:44.37+00:00

Hi @广凯李,

Currently in Microsoft Q&A we only support English. Could you please edit your question into English? Then we can help to solve your issues. Thanks for your understanding.
Anonymous

2023-05-29T03:16:59.6+00:00

Hi @广凯李,

Would you please provide a code example for us to reproduce this issue? This would help us better understand this difference between Edge and IE.

广凯李 20

This is my code. スクリーンショット 2023-05-29 120328

specialCharacter.txt

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        input {
            width: 1000px;
        }
    </style>
</head>

<body>
    「＜＆＞＆“”＆‘’」
    <br>
    「2 > 1 & 1 < 3 & "aa" & 'bb' & <abc>」
    <br>
    「&#57734;&lt;&gt;&amp;&nbsp;&apos;&quot;」
    <br>
    「￥≒①∑∵№￢￤仡炻伹仼﨏﨎塚晴朗骶杮か゚㐂侮㉑𠀋俱𠮟☺𠮷ϴϵ⅊」
    <hr>
    <input type="text" value="＜＆＞＆“”＆‘’" maxlength="10">
    <input type="text" value="2 > 1 & 1 < 3 & " aa" & 'bb' & <abc>" maxlength="10">
    <input type="text" value="&#57734;&lt;&gt;&amp;&nbsp;&apos;&quot;" maxlength="10">
    <input type="text" value="￥≒①∑∵№￢￤仡炻伹仼﨏﨎塚晴朗骶杮か゚㐂侮㉑𠀋俱𠮟☺𠮷ϴϵ⅊" maxlength="35">

    <input type="text" value="𠀋" maxlength="2">
    <input type="text" value="𠮟" maxlength="2">
    <input type="text" value="𠮷" maxlength="2">
</body>

</html>

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Anonymous

2023-05-29T01:58:44.37+00:00

Hi @广凯李,

Currently in Microsoft Q&A we only support English. Could you please edit your question into English? Then we can help to solve your issues. Thanks for your understanding.
Anonymous

2023-05-29T03:16:59.6+00:00

Hi @广凯李,

Would you please provide a code example for us to reproduce this issue? This would help us better understand this difference between Edge and IE.
广凯李 20 Reputation points

2023-05-29T03:54:26.9566667+00:00

This is my code.

specialCharacter.txt

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> input { width: 1000px; } </style> </head> <body> 「＜＆＞＆“”＆‘’」 <br> 「2 > 1 & 1 < 3 & "aa" & 'bb' & <abc>」 <br> 「<>& '"」 <br> 「￥≒①∑∵№￢￤仡炻伹仼﨏﨎塚晴朗骶杮か゚㐂侮㉑𠀋俱𠮟☺𠮷ϴϵ⅊」 <hr> <input type="text" value="＜＆＞＆“”＆‘’" maxlength="10"> <input type="text" value="2 > 1 & 1 < 3 & " aa" & 'bb' & <abc>" maxlength="10"> <input type="text" value="<>& '"" maxlength="10"> <input type="text" value="￥≒①∑∵№￢￤仡炻伹仼﨏﨎塚晴朗骶杮か゚㐂侮㉑𠀋俱𠮟☺𠮷ϴϵ⅊" maxlength="35"> <input type="text" value="𠀋" maxlength="2"> <input type="text" value="𠮟" maxlength="2"> <input type="text" value="𠮷" maxlength="2"> </body> </html>

Answer 1

Hi @广凯李,

Thanks for your code example. I have performed a test accordingly. What I have discovered is modern browsers all behave in the same way as Microsoft Edge that "𠀋" (and other characters belonging to "Supplementary Ideographic Plane") takes up two code units.

This is because the HTML5 spec says that maxlength applies to the JavaScript string length which is the number of UTF-16 code units. So codepoints beyond 0xFFFF like Emojis and Supplementary Ideographic Plane count as two code units. So, it is an expected behavior in Edge and other modern browsers.

As to IE, it has retired and is officially out of support. it is not a browser for HTML5.

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Best Regards,

Shijie Li

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The same special character, why is the number of bits displayed in edge and ie different?

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