When you insert an image in the editor, you can flag it as ‘Dynamic.’ Dynamic images are images that change depending on one or more values that are ‘passed’ to the system that delivers them. The link to the image is no longer a static URL but rather a URL that contains some variables, such as an email, a customer ID, a date, etc.
The variables are merge tags in the URL and are replaced with actual values (e.g. the ID of a customer, the email of the recipient, the name of the person) at the time the email is sent, or the landing page is rendered.
For example, you can use the dynamic images feature when you are using a third-party service that displays a different image in each contact’s own email client depending upon the personalized information dynamically provided in the full URL of the image.
The Custom HTML content block allows you to add your own HTML code to an email message that you are designing with the editor. It’s as simple to use as a text block.
Note for HTML Experts: Using your own code may affect how the message is rendered in email clients, preventing it from adjusting to the screen size (i.e. the "responsiveness" of the message). Make sure to use HTML that is email compliant and responsive.
How do I add my HTML code?
To add your code, just drag an HTML content element into your message. It can be positioned alone, with other HTML content items, or mixed with other types of content;
The newly inserted content block will show some default placeholder text. Click on it and the right-side property panel will display the HTML code editing panel. You will find some placeholder code inside the editing area;
Paste your own HTML code or write it directly in the editing area. The system will highlight your syntax and indent your code to make it more readable.
Which HTML tags are allowed?
The HTML content will automatically correct some issues like HTML tags that are left open, and strip out code that cannot be used, such as script tags or iframe tags (this code tags are not allowed by the major part of email clients, can cause deliverability problems or security risks)
Allowed tags list:
a, abbr, acronym, address, area, b, bdo, big, blockquote, button, caption, center, cite, code, colgroup, dd, del, dfn, dir, div, dl, dt, em, fieldset, font, form, h1, h2, h3, h4, h5, h6, i, ins, kbd, label, legend, li, map, menu, ol, optgroup, option, p, pre, q, s, samp, select, small, span, strike, strong, sub, sup, table, tbody, td, textarea, tfoot, th, thead, u, tr, tt, u, ul, var
Allowed attributes list:
general attributes: style, id, class, data-*, title
a: href, name, target
img: align, alt, border height, hspace, src, vspace, width, usemap
table: align, bgcolor, border, cellpadding, cellspacing, width
tbody: align, valign
td: align, bgcolor, colspan, height, rowspan, valign, width
tr: align, bgcolor, valign
tfoot: align, valign
th: align, bicolor, colspan, height, rowspan, valign, width
thead: align, valign
area: alt, coords, href, shape, target