How can I solve the problem of incompatibility between PHP project IE and Firefox?

How can I solve the problem of incompatibility between PHP projects in IE and Firefox? how can I solve the problem of incompatibility between PHP projects in IE and Firefox?

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Css and js Compatibility issues
No picture or truth
Code is used to obtain the truth.

Css and js Compatibility issues
No picture or truth
Code is used to obtain the truth.
How can I debug the CSS style? I wrote it, and then I guess it is the effect I don't want...

Firebug debugging in firefox is good. You can try it.

Some special attributes in the style sheet need to write attributes with the same name but with underlines before ie.
You can search for the attributes you are using online and there is an answer immediately.

Firebug debugging in firefox is good. You can try it.
I have never used it... how can I see it after reading it...

There is no problem in firefox. what is the purpose of firebug debugging?

You can use firebug debugging in firefox only when IE is normal.

You can use firebug debugging in firefox only when IE is normal.
It is normal only in IE, and there are problems in other browsers...

So, isn't there a CSS tab in your texture? Why not?

There is no problem with the pasted code. it should mainly be on css.
I 'd like to go through the html version. someone there can help you write a cross-browser css hack.

Writing code requires compatibility.
Which programmer can't put those mainstream browsers on the desktop for testing!
If it is not compatible, change it slowly until it is compatible.

Writing code requires compatibility.
Which programmer can't put those mainstream browsers on the desktop for testing!
If it is not compatible, change it slowly until it is compatible.
I really don't know what went wrong...

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So, isn't there a CSS tab in your texture? Why not?

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Child, this is incompatible with js and css, not PHP

Child, this is incompatible with js and css, not PHP
I have not referenced any JS files.

Child, this is incompatible with js and css. if it is not incompatible with PHP, you can exclude the jS issue, so there is only the CSS issue, in many programming cases, some inexplicable bugs can only be solved by division. However, you can use css to write cascading menus as such.

Isn't this slide menu ready for use? Set one.