Single vs Double quotes vs

Question

I ve always used single quotes when writing my HTML by hand  I work with a lot of rendered HTML which always uses double quotes  This allows me to determine if the HTML was written by hand or generated  Is this a good idea   What is the difference between the two  I know they both work and are supported by all modern browsers but is there a real difference where one is actually better than the other in different situations

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I have had an issue using Bootstrap where using double quotes did matter vs using single quote  which didn t work   class  row-fluid  gave me issues causing the last span to fall below the other spans rather than sitting nicely beside on the far right  whereas class  row-fluid  worked

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If it s all the same  perhaps using single-quotes is better since it doesn t require holding down the shift key  Fewer keystrokes    less chance of RSI

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Actually  the best way is the way Google recommends  Double quotes  https   google github io styleguide htmlcssguide xml showone HTML Quotation Marks HTML Quotation Marks  See https   google github io styleguide htmlcssguide xml showone HTML Validity HTML Validity Quoted Advice from Google   Using valid HTML is a measurable baseline quality attribute that contributes to learning about technical requirements and constraints  and that ensures proper HTML usage

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I use   as a top-tier and   as a second tier  as I imagine most people do  For example   lt a href     onclick  alert  Clicked      gt Click Me  lt  a gt    In that example  you must use both  it is unavoidable

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Using double quotes for HTML  i e    lt div class  colorFont  gt  lt  div gt    Using single quotes for JavaScript  i e       container   addClass  colorFont        lt div class  colorFont2 gt  lt  div gt

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Double quotes are used for strings  i e    this is a string   and single quotes are used for a character  i e    a    b  or  c     Depending on the programming language and context  you can get away with using double quotes for a character but not single quotes for a string   HTML doesn t care about which one you use   However  if you re writing HTML inside a PHP script  you should stick with double quotes as you will need to escape them  i e     whatever    to avoid confusing yourself and PHP

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It makes no difference to the html but if you are generating html dynamically with another programming language then one way may be easier than another   For example in Java the double quote is used to indicate the start and end of a String  so if you want to include a doublequote within the String you have to escape it with a backslash   String s     lt a href   link   gt a Link lt  a gt     You don t have such a problem with the single quote  therefore use of the single quote makes for more readable code in Java    String s     lt a href  link  gt a Link lt  a gt     Especially if you have to write html elements with many attributes  Note I usually use a library such as jhtml to write html in Java  but not always practical to do so

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if you are writing asp net then occasionally you have to use double quotes in Eval statements and single quotes for delimiting the values - this is mainly so that the C  inline code knows its using a string in the eval container rather than a character   Personally I d only use one or the other as a standard and not mix them  it looks messy thats all

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I m newbie here but I use single quote mark only when I use double quote mark inside the first one  If I m not clear I show You example    lt p align  center  title  One quote mark at the beginning so now I can  cite    gt       lt  p gt    I hope I helped

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In HTML I don t believe it matters whether you use   or    but it should be used consistently throughout the document   My own usage prefers that attributes html use    whereas all javascript uses   instead   This makes it slightly easier  for me  to read and check  If your use makes more sense for you than mine would  there s no need for change  But  to me  your code would feel messy  It s personal is all

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Quoting Conventions for Web Developers  The Short Answer  In HTML the use of single quotes     and double quotes     are interchangeable  there is no difference   But consistency is recommended  therefore we must pick a syntax convention and use it regularly   The Long Answer  Web Development often consists of many programming languages  HTML  JS  CSS  PHP  ASP  RoR  Python  ect  Because of this we have many syntax conventions for different programing languages  Often habbits from one language will follow us to other languages  even if it is not considered  proper  i e  commenting conventions  Quoting conventions also falls into this category for me   But I tend to use HTML tightly in conjunction with PHP  And in PHP there is a major difference between single quotes and double quotes  In PHP with double quotes  you can insert variables directly within the text of the string    scriptingok com  And when using single quotes  the text appears as it is    scriptingok com      PHP takes longer to process double quoted strings  Since the PHP parser has to read the whole string in advance to detect any variable inside   and concatenate it   it takes longer to process than a single quoted string   scriptingok com     nbsp      Single quotes are easier on the server  Since PHP does not need to read the whole string in advance  the server can work faster and happier   scriptingok com    Other things to consider   Frequency of double quotes within string  I find that I need to use double quotes     within my strings more often than I need to use single quotes     within strings  To reduce the number of character escapes needed I favor single quote delimiters  It s easier to make a single quote  This is fairly self explanatory but to clarify  why press the SHIFT key more times then you have to    My Convention  With this understanding of PHP I have set the convention  for myself and the rest of my company  that strings are to be represented as single quotes by default for server optimization  Double quotes are used within the string if a quotes are required such as JavaScript within an attribute  for example    lt button onClick  func  param     gt Press Me lt  button gt   Of course if we are in PHP and want the parser to handle PHP variables within the string we should intentionally use double quotes   a  Awesome    b    Not  a    Sources  Single quotes vs Double quotes in PHP   n d    Retrieved November 26  2014  from http   www scriptingok com tutorial Single-quotes-vs-double-quotes-in-PHP

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Using   instead of   when    lt input value  user   gt    Standard html  lt input value  user s choice   gt    Need to use single quote  lt input onclick  alert  hi     gt    When giving string as parameter for javascript function   Using   instead of   when    lt input value   User    gt    Need to use double quote var html     lt input name  username   gt     When assigning html content to a javascript variable

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The w3 org said      By default  SGML requires that all attribute values be delimited using either double quotation marks  ASCII decimal 34  or single quotation marks  ASCII decimal 39   Single quote marks can be included within the attribute value when the value is delimited by double quote marks  and vice versa  Authors may also use numeric character references to represent double quotes   amp  34   and single quotes   amp  39    For double quotes authors can also use the character entity reference  amp quot     So    seems to be no difference  Only depends on your style

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I know LOTS of people wouldn t agree  but this is what I do and I really enjoy such a coding style  I actually don t use any quote in HTML unless it is absolutely necessary   Example    lt form method post action   gt   lt fieldset gt   lt legend gt Register here   lt  legend gt     lt label for account gt Account   lt  label gt     lt input id account type text name account required gt  lt br gt     lt label for password gt Password   lt  label gt     lt input id password type password name password required gt  lt br gt        Double quotes are used only when there are spaces in the attribute values or whatever    lt form class  val1 val2 val3  method post action   gt         lt  form gt

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In PHP using double quotes causes a slight decrease in performance because variable names are evaluated  so in practice  I always use single quotes when writing code   echo  This will print you the value of  this variable    echo  This will literally say  this variable with no evaluation      So you can write this instead   echo  This will show      this variable            I believe Javascript functions similarly  so a very tiny improvement in performance  if that matters to you     Additionally  if you look all the way down to HTML spec 2 0  all the tags listed here   W3 HTML DTD Reference   Use doublequotes   Consistency is important no matter which you tend to use more often

[html] Single vs Double quotes (' vs ")

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