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Version 1
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| Characters / Examples of data | Status |
|---|
| Special characters from range 0h – 1Fh | Will be removed, except for:
t", "
n", "
r", |
< {any} | Will stay unchanged |
< 5
<5 | Will stay unchanged |
<{letter} | Will be taken as a tag and will be removed or closed (and a closing tag will be added) For example: <b will be <b></b><x will be removed
|
<! | Will be removed, as this is considered a start of <!-- which can be used for an XSS attack. |
</ | Will be taken as a closing tag. |
| HTML | Supported HTML tags and attributes are listed here. - Supported tags can be formatted/normalized, i.e. tag definition changed to lowercase, spaces removed/added, or the end of a tag changed from
<hr> to <hr /> etc. - If a closing tag in paired tags is missing, it will be added.
- Paired tags which are not defined logically will be removed, e.g.
<pre></pre> as these have no effect. (Paired tags must surround the text you want format.) - Tags which are not defined logically (internally) will be removed, e.g.
<input>, <span>, <img> – these do not make sense. - In special cases, the tag
<li> will be supplemented by a parent tag to <ul><li></li></ul>.
|
