Thursday, July 26, 2018

Limitations of HTML


Limitations of HTML


  •  HTML is also known as HyperText Markup Language provides the creation of the web pages. 
  • The HTML pages are the documents that can be read by the server, and are not the best fit to be read by humans. 
  •  HTML forms have the dependency on scripting languages and it results in complex document creation that consumes more time. 
  • HTML doesn’t initialize the form data properly and doesn’t make it easier for the users to enter the information once. 
  • HTML is having some limitations with the use of forms that doesn’t allow encoding formats, urlencoded or multipart forms.

HTML Code Limitations

Code within the HTML element is displayed on your live site within a sandboxed iFrame. Using a sandbox protects visitors to Wix sites from potential side-effects of custom HTML/JS/CSS code.
Usually, a sandboxed iFrame blocks the following:
Using Browser APIs 
Content using plugins (via <embed>, <object>, <applet>, or other) 
Automatically triggered features (such as automatically playing a video or automatically focusing a form control)

Sandbox Description
allow-same-origin Re-enables third-party site scripts/content
allow-forms         Re-enables form submission
allow-popups         Re-enables popups
allow-scripts         Re-enables custom JavaScript code
allow-pointer-lock Re-enables grabbing the cursor
allow-top-navigation Re-enables changing parent frame window.location

The script is (a lot) slower than the original FPDF and html2fpdf. Some of this is due to the inclusion of unicode font files (when used), but there is also an increase in processing time.

Limitations

Tables
Block elements (e.g. DIV or P) are not supported inside tables. The content is displayed, but any CSS properties which apply to block elements are ignored (e.g. borders, padding, margins etc).

Block and in-line elements
All HTML elements are hard-coded to be treated as block or in-line elements (e.g. equivalent to CSS display:block or display:in-line). This cannot be changed using CSS. See HTML tags.

Special features
Several of the “special” features of mPDF are incompatible with each other e.g columns, fixed-position block elements, page-break-avoid:inside, Keep-with-table and rotated tables.

Other
Millimeters are the only accepted dimensions for defining page size and margins within mPDF (CSS stylesheets accept all usual units).

Blocks which are defined as position:absolute, fixed or float have only limited support (introduced v4.0).

No comments

Post a Comment