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Adobe AD0-E720 Exam
Adobe Commerce Front-End Developer Expert (Page 4 )

Updated On: 1-Feb-2026
Page 2 of 11
PDF with 50 Questions

The merchant needs to create a new website, and is need modify a template the third party vendor's, because the customer is different. The file is found in a module here:
app/code/Vendor/Module

Keep it simple in your mind!

  1. Create another layout for the new website and configure new file.phtml.
    app/code/Vendor/Module/view/frontend/templates/file.phtml
  2. Create a new module for extends layout.xml and include new file.phtml.
    app/code/Vendor/Module_Two/view/frontend/templates/file.phtml
  3. Create a new theme, define a new website and customize in app/design.
    app/design/frontend/Custom/Theme/Vendor_Module/templates/file.phtml

Answer(s): C

Explanation:

The best way to customize a template file from a third-party module is to create a new theme that inherits from the parent theme and override the template file in the app/design/frontend/Custom/Theme/Vendor_Module/templates directory. This way, the customization is isolated from the original module and can be applied to a specific website or store view. Creating another layout file or a new module would not be as simple or flexible as creating a new theme.


Reference:

Frontend development guide, [Create a theme], [Theme inheritance]



In which mode would the stylesheet customizations display immediately after you reload a page in a browser?

  1. server- side compilation mode
  2. less-side compilation mode
  3. client-side compilation mode

Answer(s): C

Explanation:

In client-side compilation mode, the stylesheet customizations will display immediately after reloading a page in a browser. This is because in this mode, the LESS files are compiled into CSS files by the browser using JavaScript. This mode is useful for development and debugging purposes, as it allows quick changes and previews of the styles. However, this mode is not recommended for production, as it can affect the performance and compatibility of the site. The other modes, server- side compilation and LESS compilation, require running commands or tools to compile the LESS files into CSS files on the server side, which can take some time and delay the display of the customizations.


Reference:

[Compilation modes], [Compile LESS]



An Adobe Commerce developer wants to add a custom widget that extends the default Calendar Widget.
What would the contents of this file look like?

A)



B)



C)

  1. Option A
  2. Option B
  3. Option C

Answer(s): B

Explanation:

To add a custom widget that extends the default Calendar Widget, the contents of the file would look like option B. This is because option B follows the correct syntax and structure for defining a jQuery widget in Magento. The code does the following steps:

Defines a module with the name "Vendor_Module/js/calendar-widget" that depends on the "jquery/ui" and "Magento_Ui/js/lib/knockout/bindings/datepicker" modules.

Returns a function that creates a new widget with the name "vendor.calendarWidget" that extends the base calendar widget class.

Overrides the init function of the base calendar widget class to add custom logic or functionality to the widget.

Option A is not correct because it does not use the correct syntax for defining a jQuery widget. It uses a script tag instead of a define function, which is not valid for creating a module. It also uses an incorrect name for the widget, which should use a dot instead of a slash. Option C is not correct because it does not use the correct syntax for extending a widget. It uses an extend function instead of a widget function, which is not valid for creating a new widget. It also does not return anything from the module, which will cause an error.


Reference:

[jQuery widgets], [Calendar Widget]



An Adobe Commerce developer wants to apply a knockout binding to a <div> to run a function, onClick(), when it's clicked.
Which two solutions would the developer use to achieve this? (Choose two.)

  1. <div data-bind="click: onClick()"><x/div>
  2. <div><!-- ko click: 'onClick' --> <!-- /ko --></div>
  3. <div data-bind="click: onClick"></div>
  4. <div click=,,onClick"X/div>

Answer(s): A,C

Explanation:

To apply a knockout binding to a <div> to run a function, onClick(), when it's clicked, the developer can use either of the following solutions:

A) <div data-bind="click: onClick()"></div>: This solution will use the click binding to execute the onClick() function as an expression when the <div> is clicked. The function will be called with the current binding context as the first parameter and the event object as the second parameter.
C) <div data-bind="click: onClick"></div>: This solution will use the click binding to execute the onClick function as a reference when the <div> is clicked. The function will be called with the current binding context as the first parameter and the event object as the second parameter.

The following solutions are not valid and will not work:
B) <div><!-- ko click: `onClick' --><!-- /ko --></div>: This solution will use the virtual element syntax to apply the click binding, but it will pass a string literal instead of a function expression or reference. This will cause an error, as the click binding expects a function value.
D) <div click="onClick"></div>: This solution will use a custom attribute instead of a data-bind attribute to apply the click binding. This is not supported by knockout and will not have any effect.



An Adobe commerce developer wants to initialize a JavaScript component using a data attribute.
Which option would initialize the JavaScript component?

  1. <nav data-bind='{"<component_name>": {...}}'></nav>
  2. <nav data-init='{"<component_name>": {...}}'></nav>
  3. <nav data-mage-init='{"<component_name>": {...}}'></nav>

Answer(s): C

Explanation:

To initialize a JavaScript component using a data attribute, the developer should use the data-mage- init attribute. This attribute allows the developer to specify the name and configuration of the component in a JSON format. For example:

<nav data-mage-init=`{"Vendor_Module/js/nav": {"option1": "value1", "option2": "value2"}}'></nav>

This will initialize the nav component from the Vendor_Module/js/nav file with the given options. The data-bind and data-init attributes are not valid and will not work, as they are not supported by Magento.


Reference:

[JavaScript initialization], [data-mage-init]



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