html5 - Is it possible to edit an html file through a javascript based app? -

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good day! want apologize bad title, not sure how express question in short manner.

consider following situation: have html form (regardless fields) , have empty spaces. example consider has space text , space receiver. both styled css, inner html left empty.

my question following: possible create program javascript edit (rather set) inner html of file , create new file containing it.

my research far hasn't been successful, , starting think not possible (because can't directly read files javascript) decided ask here last resort.

as far know, security reasons, javascript cannot access file system , design. hence, cannot read or change files using javascript or client based programming language. need server side languages php, c# achieve goal.


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