What is amp used for

Question

Is there any difference in behaviour of below URL   I don t know why the  amp amp  is inserted  does it make any difference    www testurl com test param1 test amp amp current true   versus  www testurl com test param1 test amp current true

User · Accepted Answer

amp  is HTML for  Start of a character reference     amp amp  is the character reference for  An ampersand     amp current  is not a standard character reference and so is an error  browsers may try to perform error recovery but you should not depend on this    If you used a character reference for a real character  e g   amp trade   then it   trade   would appear in the URL instead of the string you wanted    Note that depending on the version of HTML you use  you may have to end a character reference with a    which is why  amp trade  will be treated as  trade   HTML 4 allows it to be ommited if the next character is a non-word character  such as    but some browsers  Hello Internet Explorer  have issues with this

User · Answer

My Source  http   htmlhelp com tools validator problems html amp     Another common error occurs when including a URL which contains an   ampersand    amp       This is invalid      a href  foo cgi chapter 1 amp section 2 amp copy 3 amp lang en    Explanation       This example generates an error for  unknown entity section  because   the   amp   is assumed to begin an entity reference  Browsers often   recover safely from this kind of error  but real problems do occur in   some cases  In this example  many browsers correctly convert  amp copy 3   to    3  which may cause the link to fail  Since  lang  is the HTML   entity for the left-pointing angle bracket  some browsers also convert    amp lang en to

User · Answer

HTML doesn t recognize the  amp  but it will recognize  amp amp  because it is equal to  amp  in HTML  I looked over this post someone had made  http   www webmasterworld com forum21 8851 htm

User · Answer

if you re doing a string of characters   make    let linkGoogle    https   www google com maps dir  api 1    let origin     amp origin     locations 0  1          locations 0  2     aNav href   linkGoogle   origin

User · Answer

That s a great example  When  amp current is parsed into a text node it is converted to   t  When parsed into an attribute value  it is parsed as  amp current  If you want  amp current in a text node  you should write  amp amp current in your markup  The gory details are in the HTML5 parsing spec - Named Character Reference State

[forms] What is &amp used for

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